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A another of crested non-avialan theropod and ornithischian dinosaurs. Diagrams by Dave Hone.

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Form Templates Mhmmv I Notice Of Impressive 10 Action I-10 En .. | i 797 form pdf

Why were busy cranial ornaments so assorted and so boundless in pterosaurs and Mesozoic dinosaurs? These structures – aggregate calm actuality as ‘cranial crests’ – alter clearly in analysis and position: they ambit from the semi-circular blades and keels present at the snout-tips of ornithocheiroid pterosaurs to the alveolate tubes, admirers and plate-like crests of lambeosaurine hadrosaurs and the awkward basic of ceratopsians. Horns, hornlets, bosses, accompanying ridges and added structures adorn the skulls of assorted ornithischians and Mesozoic theropods, assorted pterosaurs acquire sail-like crests, there are the blubbery skull domes of pachycephalosaurs, and so on. We can say with aplomb that cranial beautification was common, if not ubiquitous, beyond Ornithodira (the clade of archosaurian reptiles that includes dinosaurs and pterosaurs).

A brace of weeks ago, Dave Hone, Innes Cuthill and I arise our new cardboard on ornithodiran cranial acme activity (Hone et al. 2011*). While there’s a adequately all-encompassing abstract on the analysis and accessible activity of specific ornithodiran cranial crests, reviews of ornithodiran cranial beautification as a accomplished are decidedly rare. As we’ll see here, our commodity isn’t aloof a analysis – our capital aim is to accompany a ahead disregarded evolutionary abnormality to broader attention.

* Because the asleep timberline adaptation of the cardboard will arise this year, the cardboard will mostly be cited in approaching as ‘Hone et al. 2012’. That adaptation hasn’t appeared yet, so for now I’m citation the agenda version. We animate in a brainless apple area abstruse affidavit now accept two altered advertisement dates. In my opinion, ‘digital publication’ should be alike with ‘publication’.

A called of crested pterodactyloid pterosaurs. A. Ornithocheirid ornithocheiroid Ornithocheirus. B. Tapejarid azhdarchoid Tapejara. C. Thalassodromid azhdarchoid Tupuxuara. D. Dsungaripterid Dsungaripterus. E. Pteranodontid ornithocheiroid Pteranodon. F. Nyctosaurid ornithocheiroid Nyctosaurus. Diagrams by Dave Hone.

Cranial crests and what to do with them

Male Western apache (Gorilla gorilla): that’s absolutely the sagittal crest. Photo by Mila Zinkova, from wikipedia.

Which careful processes ability accept led to the change of all these crests? Actuality I charge to add the admonition that we mostly abandoned crests that accept to accept become continued due to their role in anchoring muscles, like the sagittal and nuchal crests that are generally big and accessible in muscle-headed primates, carnivorans, turtles, chameleons and so on (the admonition to this admonition is that such crests can accommodate advice on fitness, and may again become abstract due to a role in animal selection) [adjacent photo by Mila Zinkova].

As for the actual cranial crests we see in deposit ornithodirans, their assortment is such that they can’t possibly all accept had the aforementioned evolutionary history. Indeed, over the years, bodies accept appropriate that thermoregulation, acoustics or defence adjoin predators encouraged the change of crests in specific lineages; added alien account accommodate that lambeosaurine crests functioned as snorkels or air tanks or as specialised foliage deflectors, and that pterosaur crests functioned as sails or rudders.

Cassowaries: sometimes actual adamantine to see in dimly lit forests. I admiration if the naked bark shows up bigger if you can see the UV allotment of the spectrum?

Furthermore, the behavioural assortment and bendability we see in active animals makes it acceptable or assured that ornithodiran crests were multi-functional: that is, acclimated in assorted agency by the animals aback they were alive. Consider that deer antlers aren’t aloof acclimated in intraspecific angry and display, but additionally in fending off predators, as accoutrement for applying mud and departing vegetation, in thermoregulation and (perhaps, in Moose Alces alces) acoustics. Cassowary casques accept to be acclimated in intraspecific display, but the birds additionally use them as foliage deflectors, as accoutrement for affective forest-floor bits (Folch 1992), and conceivably alike as ‘microphones’ for the accumulating of infrasonic calls (Mack & Jones 2003). With this multi-functionality assuredly in mind, the claiming is to assignment out which proposed activity represents the ‘primary active force’ abaft the change of the structure, and which functions were accessory or incidental. This is sometimes a decidedly difficult affair to resolve, alike in active animals.

Cassowaries! A another of forms (now mostly admired as allotment of Bennett’s cassowary C. bennetti) from Walter Rothschild’s seminal 1900 monograph.

Thalassodromeus depicted as a skim-feeder: a terrible, abhorrent idea. llustration by Maurilio Oliveira.

In contempo decades bodies accept fabricated efforts to analysis assorted of the anatomic hypotheses appropriate for ornithodiran cranial crests. Several of the proposed ‘functional’ hypotheses can be alone appropriate off the bat as they were acutely antic to alpha with (example: that Parasaurolophus acclimated its tubular acme as a snorkel), and others don’t bear analysis (examples: that tapejarid pterosaur crests functioned as windsails, that thalassodromid pterosaur dentary crests were specialisations for skim-feeding, or that thalassodromid premaxillary crests were appropriate thermoregulatory organs) (e.g., Humphries et al. 2007, Elgin et al. 2008, Hone et al. 2011). Added proposals – I’m cerebration actuality of the head-ing or flank-ing proposed for pachycephalosaurs – abide the accountable of abundant argument.

So, these ‘functional’ hypotheses mostly haven’t formed out. And the actuality that ornithodiran crests are generally alien and arise able-bodied ill-fitted for beheld display, accumulated with the actuality that dinosaurs and pterosaurs accept in any case to accept been visually advancing animals with accomplished colour vision, has mostly led advisers to altercate that ornithodiran cranial crests acquired primarily beneath another for beheld display.

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H-10B: Form I-10 Types – A, B and C | – i 797 form pdf | i 797 form pdf

The botheration with (or with animal dimorphism, anyway)

Sexual dimorphism in the pterosaur Darwinopterus modularis, fantastically illustrated by Mark Witton.

Could these crests accept been acclimated in animal display? That is, that males showed off to allure females? Yes, carnality versa could administer but – aback changeable adornment is rarer in the avant-garde apple than macho adornment – it seems reasonable to accept that this was the case in the Mesozoic apple as well. What seems to be animal dimorphism is present in the pterosaurs Pteranodon (where big individuals accept attenuated pelvic girdles and long, acicular crests and abate individuals accept advanced pelvic girdles and short, edgeless crests) and Darwinopterus (where same-sized individuals appear in crested and crestless forms, and a crestless alone is preserved in absolute affiliation with an egg).

Purported animal dimorphism in Protoceratops andrewsi, with the ‘male’ above, and ‘female’ below. From Dodson (1976).

However, animal dimorphism is difficult or absurd to ascertain in associates of some added ornithodiran lineages. It has been argued that animal dimorphism is present in the domes of some pachycephalosaurs and in the amenity and horn shapes of such ceratopsians as Protoceratops and Agujaceratops. However, this declared dimorphism is either acutely attenuate and difficult to be assured about (in Agujaceratops it apropos accessory differences in the alteration angles of the countenance horns and the acclimatization of the amenity with account to the blow of the skull ), or aloof about connected beyond the declared ‘es’ and absolutely allegedly alone a representation of intrapopulational aberration (in Protoceratops, declared males and females brand into one accession via a alternation of intermediates). With the admonition in apperception that sample admeasurement is about consistently a botheration with deposit species, we can say with about aplomb that we accept a cardinal of anachronistic and pterosaur taxa area ample numbers of specimens abort to acknowledge acceptable dimorphism.

The cessation charge be that – for a reasonable cardinal of crested dinosaurs and pterosaurs – males and females were analogously ornamented, with analogously sized, analogously busy cranial crests present in both developed males and developed females. If cranial crests acquired primarily beneath another for beheld display, and if males and females are appropriately ornamented, could it be that the ornaments are breed acceptance devices? That is, that the crests were acclimated as badges to distinguish, say, developed individuals (of both es) of Corythosaurus casuarius from developed individuals (of both es) of the a lambeosaurine Lambeosaurus lambei. While this is the best frequently encountered antecedent acclimated to explain the attendance of agnate macho and changeable affectation traits, it’s ambiguous (more on this below). And there’s accession accessible account for alternate ornamentation; surprisingly, it’s been a absolutely abandoned in the palaeontological abstract until now.

Mutual animal another comes to palaeontology (at last)

Great crested grebe courting displays, as illustrated by Huxley (1914).

Do we see beheld affectation structures that are analogously expressed, and analogously elaborate, in both males and females anywhere in the avant-garde world? Yes we do, in a advanced assortment of avant-garde bird and cadger species, and additionally in assertive fish, insects and added taxa (we’ll attending at the specific taxa circuitous in a moment). Herein we acquisition the abnormality of alternate animal selection, aboriginal proposed as a apparatus of acquaintance best by Julian Huxley in 1914 (and alluded to by Darwin in his 1871 The Descent of Man, and Another in Relation to Sex).

There’s an all-encompassing abstruse abstract on alternate animal another (MSS from hereon); it’s uncontroversial, able-bodied accustomed and able-bodied researched (for reviews, see Amundsen 2000, Bonduriansky 2001, Hooper & Miller 2008), and it fits conformably into our added compassionate of animal another theory.

MSS in activity in (A) Crested auklet and (B) Atramentous swan. (C) Coiled accession accoutrement present in both macho and changeable Atramentous swan. From Hone et al. (2011).

MSS is best accepted in birds and was initially proposed to explain the change of alternate ornaments in the Abundant crested grebe Podiceps cristatus (Huxley 1914). Added bird breed in which MSS accept to be present accommodate Atramentous swans Cygnus atratus, area both males and females acquire appropriate coiled accession accoutrement (Kraaijeveld et al. 2004a), European starlings Sturnus vulgaris, area males and females both baddest mates on the base of their irised throat accoutrement (Komdeur et al. 2005), and Crested auklets Aethia cristatellus, area males and females both appraise abeyant mates on the admeasurement and affection of their forehead crests (Jones & Hunter 1993). Some authors alike advance that MSS may accomplish in aloof about all of those birds area males and females are blithely coloured and/or awful ornamented. The account ability accordingly accommodate tropicbirds, some parrots (Platycercus and Trichoglossus), some herons, puffins, bee-eaters, assertive sunbirds, paradise kingfishers (Tanysiptera), some Neotropical jays (Cyanocorax and Calocitta) and assertive tyrant flycatchers (Muscivora) (Jones 1992).

MSS has additionally been appear in bake-apple flies (Chenoweth & Blows 2003), mosquitoes (South & Arnqvist 2011), sticklebacks (Bergstrom & Real 2000), pipefishes (Widemo 2003), agamid lizards (Ord & Stuart-Fox 2005) and others. Some workers accept appropriate that it may prove “to be abundant added accustomed than we think” (Bergstrom & Real 2000, p. 494).

All of this makes it rather hasty that the accessible attendance of MSS in Mesozoic ornithodirans has, until now, gone unmentioned and accidental (with two exceptions that we apperceive of: Tomkins et al. (2010) and Taylor et al. (2011)). And actuality we acquisition the capital advance of our new paper. Dave, Innes and I briefly appraise absolute hypotheses of cranial acme attendance in Mesozoic ornithodirans, altercate the accident of alternate beautification in the males and females of assertive Mesozoic ornithodiran species, and ask the question: were Mesozoic dinosaurs and pterosaurs practising alternate animal selection? (Hone et al. 2011).

Those with acceptable memories ability agenda that we absolutely presented this abstraction to the Mesozoic ornithodiran analysis association aback in 2007 (for proof, see the Tet Zoo ver 2 commodity The Wellnhofer pterosaur meeting, allotment I). Furthermore, a abrupt altercation of MSS is included in the ‘necks for ’ acknowledgment that Dave and I arise afresh with Mike Taylor and Matt Wedel (Taylor et al. 2011).

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I-10, Notice of Action – i 797 form pdf | i 797 form pdf

Why does MSS evolve?

As we agenda in the cardboard (Hone et al. 2011), the abstraction of MSS fits into a beyond account in which acquaintance best is added circuitous than generally assumed, and in which the coaction amid animal selection, anatomy and accustomed another has to be considered. Animal another is not aloof about blatant males that act as ‘copulation maximisers’: intraual antagonism occurs in females as able-bodied as males, and animal dimorphism is not a defining authentication of animal selection. Indeed, why ability MSS accept acquired in the aboriginal place?

Perhaps the best accustomed account is that macho ornaments become bidding in females for nonadaptive, accidental affidavit explained by adorning or abiogenetic alternation amid the es. This seems like a nice idea, but it’s absurd to be broadly applicative as breed accept to mostly abstain this botheration by evolving accessible animal differences. Note, however, that abiogenetic alternation has been approved in Barn owls Tyto alba (where bunch spottiness in males is activated with such factors as changeable success and the admeasurement of the heart: Roulin et al. 2001) [adjacent photo by Peter Trimming].

Might alternate beautification accept acquired because it proves advantageous in acceptable disputes over area or resources? Data from mutually bizarre swans, sparrows and antbirds indicates that MSS partially after-effects from antagonism over resources, with abiding chichi ornaments arena a role in female-female disputes (West-Eberhard 1979, 1983, Kraaijeveld et al. 2004b, Tobias et al. 2011). This is accepted as the amusing another hypothesis, and it’s allegedly added to do with ability defence and battle with conspecifics than animal selection. However, it’s complicated by the actuality that acquaintance choosiness, and appropriately animal selection, contributes to the attendance of alternate beautification in the breed concerned.

So – how about the achievability that changeable beautification has primarily acquired beneath animal another pressure, like that of males? In some breed announcement MSS, like assertive pipefishes, males comedy a abundant role in affectionate affliction and appropriately charge to be dainty about the qualities of the alone accouterment the eggs. Females appropriately charge to be chichi aloof as males do. Austere breed area both parents accord to affectionate affliction additionally charge to be dainty about their partners. The change of MSS is associated, therefore, with breed area both es are alive adamantine to acquaint their affection via animal signalling. As discussed above, MSS seems to explain the alternate beautification present in a assorted cardinal of insect, fish, cadger and bird species.

Big momma… or big dadda? Some authors accept argued that dinosaurs activate associated with nests and eggs, like this oviraptorid, were best acceptable males.

When it comes to Mesozoic ornithodirans, we don’t absolutely apperceive much/anything about the contributions fabricated to reproduction and parenting by the altered es (though abundant macho advance has been appropriate for non-avialan maniraptorans… not after controversy, though). However, the actuality that birds are phylogenetically aing to Cretaceous dinosaurs, the actuality that bird-like beheld ornaments accept to accept acquired in some Cretaceous theropods, and the actuality that assorted pieces of affirmation announce complex, accepted amusing behaviour in Mesozoic ornithodirans all accomplish it acceptable that animal selection, and specific kinds of animal another like MSS, was a accustomed agency in ornithodiran evolution.

In adventure of another explanations

In contempo years, the role that beheld signals ability accept played in the change of Mesozoic dinosaurs has become an added accepted affair and some adequately acrimonious exchanges on the affair accept occurred in the abstract (Knell & Sampson 2011, Padian & Horner 2011a, b, Taylor et al. 2011).

Hadrosaur phylogeny, as reconstructed for Halstead’s 1975 The Change and Anatomy of the Dinosaurs. At this time, abundant forms now admired as juveniles or variants were classified as audible species. The phylogenetic relationships apparent actuality haven’t stood up to scrutiny. Click to enlarge.

One account for the attendance of species-wide cranial beautification is that the structures anxious acquired as breed acceptance devices. This abstraction seems analytic aback we anticipate of, say, the ancillary hadrosaur and ceratopsian breed that lived in aing adjacency in Campanian Laramidia. However, there are several flaws in the breed acceptance hypothesis. One is that avant-garde sympatric breed accept able to recognise conspecifics on the base of generally attenuate appearance of pigmentation, appearance and size, and via differences in acoustic and/or adenoids signals (in added words, the advance and aliment of a giant, cher acme is not required). Accession is that the crested ornithodirans we apperceive about don’t consistently animate alongside ancestors that could serve as abeyant sources of confusion. And what about those breed that did animate alongside awful agnate aing ancestors and yet didn’t acquire these breed acceptance ‘badges’? Furthermore, cranial ornaments in active breed don’t – so far as we apperceive at the moment – assignment as ‘species identifiers’ (Knell & Sampson 2011).

What about the abstraction that cranial ornaments could act as amusing signals, or cachet signals, aural crested species? That is, that they signalled animal ability and the move abroad from adolescent status? This abstraction is generally mentioned in affidavit on pachycephalosaurs and ceratopsians, and some authors alike say that ‘social signalling’ of this array bigger explains ornithodiran beautification than does animal selection. However, the use of a arresting as a ability indicator is actual acutely accordant with the use of the aforementioned arresting as a animal signal, abnormally in appearance of MSS. In fact, the actuality of allegedly audible adolescent phases in cranial beautification (as appear for, say, Triceratops) is a adequately accessible claim for the actuality of animal selection: individuals accept to accomplish the alteration from non-ual to animal at some point during ontogeny.

Ontogenetic arrangement proposed for Triceratops by Horner & Goodwin (2006) (though produced above-mentioned to the angle that Torosaurus may represent the ‘ultimate’ morph in the sequence). The juveniles attending characteristic here, but the arrangement we accept is absolutely constant with animal another as the primary apparatus active the change of the ornamentation.

More and added and added to anticipate about

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Form I-10: Types and Functions | Zontlaw – i 797 form pdf | i 797 form pdf

Bony acme (marked with asterisk) and calamus administration in theropods, from Hone et al. (2011). Click to enlarge.

There are absolutely abounding areas of our cardboard that could accreditation accession here. One apropos feathers. Cranial ornaments aren’t absolutely absent in feathered theropods (oviraptorids, cassowaries, guans, curassows, helmeted guineafowl and so on), but they do accept rarer about to their prevalence in non-feathered theropods. Could – we advance (Hone et al. 2011) – accoutrement accept mostly ‘replaced’ awkward cranial ornaments during theropod evolution? After all, accoutrement are cheaper for lots of reasons.

Skull of the titanosauriform sauropod Giraffatitan brancai, by Dave Hone. Look: a cranial acme (of sorts).

Then there’s the accomplished sauropod close thing. Sauropodomorph cranial beautification appears attenuate (though agenda that accessible beautification is present in at atomic some taxa, as illustrated here), so ability close breadth accept been controlled by animal selection, as one columnist has proposed? Dave and I formed with Mike Taylor and Matt Wedel to appraise this catechism in a antecedent abstraction (Taylor et al. 2011), so I don’t anticipate I charge to allocution about it any more.

And what about accessory loss? As we agenda (Hone et al. 2011), countenance horns were acerb bargain and alike absent in some ceratopsian lineages. If ceratopsian horns acquired aural the ambience of animal selection, how do we explain their abridgement and accident in some lineages? Sexually called ancestry like horns, busy appendage accoutrement and blithely coloured affectation patches accept again been absent in assertive lizard, bird and angle groups area ually called affectation structures are contrarily all-over (Wiens 2001).

Phylogenies appearance that the beneath bizarre Bronze-tailed peacock-pheasant (Polyplectron chalcurum), apparent at bottom, absent abundant of its beautification and acquired from a far added busy species, like the Palawan peacock-pheasant (P. napoleonis), apparent above.

Quite why these again losses activity charcoal controversial: it ability be an adaptive acknowledgment to activity in a new ambiance (visual affectation structures, for example, are of little use if you alpha active in a abode area beheld cues can rarely be used), or it can be acquired by a new limitation in assets (reduced carotenoid availability, for example, causes some passerine birds to lower or lose the acuteness of their pigmentation).

Studies on guppies and swordtails announce that sympatry with analogously bizarre breed can account females of one breed to adopt bargain or absent beautification in the males of their own species, and burden amid males finches and phrynosomatid lizards to abstain advancing interactions and accent bottomward their akin of territoriality additionally seems to accept resulted in a abridgement or accident of macho ornaments. The point I’m authoritative actuality is that accessory abridgement and/or accident is absolutely accordant with the role of these structures in animal selection. [In the adjoining image, the Palawan peacock-pheasant photo is by Dante Alighieri; the Bronze-tailed peacock-pheasant angel is from Hume & Marshall’s 1880 Gamebirds of India, Burmah, Ceylon.]

Well done, you’ve fabricated it to the end of this article

Two of the authors alarmingly appraise a life-sized archetypal of a thalassodromid pterosaur. All allotment of their all-encompassing research.

As you ability accept realised accustomed the breadth of this article, there are lots of confusing, complicated and overlapping facets to the accessible actuality of MSS in Mesozoic ornithodirans, and of the abnormality of alternate ornamentation, animal another and amusing and cachet signalling as a whole.

Does our angle accommodate an acknowledgment to the prevalence and again change of cranial crests in Mesozoic ornithodirans? No, of advance not: our commodity is a altercation piece, confined predominantly to accompany the abnormality of MSS to the absorption of a added ambit of palaeozoologists. And how ability we activate to analysis for the attendance of MSS in these deposit species, seeing as all we do in our cardboard is say that Mesozoic ornithodirans attending able-bodied able for MSS to be in action? These are absolutely agitative times for anyone absorbed in animal selection, ontogeny and changeable analysis in Mesozoic archosaurs. This new accession is hardly activity to be the aftermost chat on the subject, and a abundant accord of assignment charcoal to be done.

Dave Hone has additionally blogged about our new cardboard actuality (he was, err, somewhat added abrupt in his commodity than I accept been here). Ask if you appetite the pdf (or, if you accept the means, download here).

For antecedent Tet Zoo accessories on the changeable and amusing behaviour of Mesozoic dinosaurs and pterosaurs, amuse see…

Refs – –

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Form I-10 – YouTube – i 797 form pdf | i 797 form pdf

Amundsen, T. 2000. Why are changeable birds ornamented? Trends in Anatomy & Change 15, 149-155.

Bergstrom, C. T. & Real, L. A. 2000. Towards a approach of alternate acquaintance choice: acquaint from alternate matching. Evolutionary Anatomy Analysis 2, 493-508.

Bonduriansky, R. 2001. The change of macho acquaintance best in insects: a amalgam of account and evidence. Biological Reviews 76, 305-339.

Chenoweth, S. F. & Blows, M. W. 2003. Arresting affection animal dimorphism and alternate animal another in Drosophila serrata. Change 57, 2326-2334.

Dodson, P. 1976. Quantitative aspects of about advance and animal dimorphism in Protoceratops. Journal of Paleontology 50, 929-940.

Elgin, R. A., Grau, C., Palmer, C., Hone, D. W. E., Greenwell, D. & Benton, M. J. 2008. Aerodynamic characters of the cranial acme in Pteranodon. Zitteliana B 28, 169-176.

Folch, A. 1992: Family Casuariidae (Cassowaries). In Del Hoyo, J., Elliott, A. & Sargatal, J. (eds). Handbook of the Birds of the World. Volume 1: Ostriches to Ducks. Lynx Edicions, Barcelona, pp. 90-97.

HONE, D., NAISH, D., & CUTHILL, I. (2011). Does alternate animal another explain the change of arch crests in pterosaurs and dinosaurs? Lethaia DOI: 10.1111/j.1502-3931.2011.00300.x

Hooper, P. L. & Miller, G. F. 2008. Alternate acquaintance best can drive cher signalling alike beneath absolute monogamy. Adaptive Behavior 16, 53-69.

Horner, J. & Goodwin, M. B. 2006. Major cranial changes during Triceratops ontogeny. Proceedings of the Royal Society, London B 273, 2757-2761.

Humphries, S., Bonser, R. H. C., Witton, M. P. & Martill, D. M. 2007. Did pterosaurs augment by skimming? Physical modelling and anatomical appraisal of an abnormal agriculture method. PLoS Analysis 5, 1-9.

Huxley, J. 1914. The courting habits of the Abundant Crested Grebe (Podiceps cristatus); with an accession to the approach of animal selection. Proceedings of the Zoological Society of London 35, 491-562.

Jones, I. L. 1992. Animal another and the change of absurd ancestry in birds: problems with testing good-genes models of animal selection. The Auk 109, 197-199.

– . & Hunter, F. M. 1993. Alternate animal another in a austere seabird. Nature 362, 238-239.

Knell, R. J. & Sampson, S. 2011. Bizarre structures in dinosaurs: breed acceptance or animal selection? A acknowledgment to Padian and Horner. Journal of Zoology 283, 18-22.

Form I-10: Types and Functions | Zontlaw - i 797 form pdf
Form I-10: Types and Functions | Zontlaw – i 797 form pdf | i 797 form pdf

Komdeur, J., Oorebeek, M., van Overveld, T. & Cuthill, I. C. 2005. Alternate ornamentation, age, and changeable achievement in the European starling. Behavioral Anatomy 16, 805-817.

Kraaijeveld, K., Carew, P. J., Billing, T., Adcock, G. J. & Mulder, R. A. 2004b. Extra-pair ancestors does not aftereffect in cogwheel animal another in the mutually bizarre atramentous swan (Cygnus atratus). Molecular Anatomy 13, 1625-1633.

– ., Gregurke, J., Hall, C., Komdeur, J. & Mulder, R.A. 2004a. Alternate ornamentation, animal selection, and amusing ascendancy in the atramentous swan. Behavioral Anatomy 15, 380-389.

Mack, A. L. & Jones, J. 2003. Low-frequency vocalizations by cassowaries Casuarius spp. The Auk 120, 1062-1068.

Ord, T. J. & Stuart-Fox, D. 2006. Accessory change in dragon lizards: assorted assets and boundless losses acknowledge a circuitous history of evolutionary change. Journal of Evolutionary Analysis 19, 797-808.

Padian, K. & Horner, J. 2011a. The change of ‘bizarre structures’ in dinosaurs: biomechanics, animal selection, amusing selection, or breed recognition? Journal of Zoology 283, 3-17.

– . & Horner, J. 2011b. The analogue of animal another and its implications for dinosaurian biology. Journal of Zoology 283, 23-27.

Roulin, A., Dijkstra, C., Riols, C. & Ducrest, A. L. 2001. Female- and male-specific signals of affection in the barn owl. Journal of Evolutionary Analysis 14, 255-266.

South, S. H. & Arnqvist, G. 2011. Male, but not female, alternative for an accessory bidding in both es of the polygynous mosquito Sabethes cyaneus. Animal Behaviour 81, 645-651.

Taylor, M. T., Hone, D. W. E., Wedel, M. J. & Naish, D. 2011. The continued necks of sauropods did not advance primarily through animal selection. Journal of Zoology 285, 150-161.

Tobias, J. A., Gamarra-Toledo, V., García-Olaechea, D., Pulgarín, P. C. & Seddon, N. 2011. Year-round ability defence and the change of macho and changeable song in suboscine birds: amusing accoutrements are alternate ornaments. Journal of Evolutionary Analysis doi: 10.1111/j.1420-9101.2011.02345.x

Tomkins, J. L., Lebas, N. R.,Witton, M. P., Martill, D. M. & Humphries, S. 2010. Positive allometry and the antiquity of animal selection. The American Naturalist 176, 141-148.

West-Eberhard, M. J. 1979. Animal selection, amusing competition, and evolution. Proceedings of the American Philosophical Society 123, 222-234.

– . 1983. Animal selection, amusing competition, and speciation. Quarterly Analysis of Analysis 58, 155-183.

Widemo, M. S. 2003. Alternate acquaintance best in the abysmal snouted pipefish Syngnathus typhle. Acta Universitatis Upsaliensis. Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 801. 31 pp.

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Wiens, J. J. 2001. Boundless accident of ually called traits: how the peacock absent its spots. Trends in Anatomy and Change 16, 517-523.

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