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These traits include the robusticity of the nuchal crest, size of the mastoid process, sharpness of the supraorbital margin, prominence of the glabella, and projection of the mental eminence.
The two species were differentiated mainly by crest size and skull proportions.
Note that the overall size and crest size also corresponds to age.
Additionally, the rudder and air brake hypotheses do not explain why such large variation exists in crest size even among adults.
Alexander Kellner suggested that the large crests of the pterosaur Tapejara, as well as other species, might be used for heat exchange, allowing these pterosaurs to absorb or shed heat and regulate body temperature, which also would account for the correlation between crest size and body size.
Weishampel in 1981 suggested that Parasaurolophus made noises ranging between the frequencies 55 and 720 Hz, although there was some difference in the range of individual species because of the crest size, shape, and nasal passage length, most obvious in P. cyrtocristatus (interpreted as a possible female).
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The Plovercrest's characteristic long, tapered crest, small size, and short tail distinguish it from all other hummingbirds.
Travel-size Crest Glide dental floss.
In addition, the enlarged crest (roughly the same size as 100 years ago) has 13 stars and 13 stripes in homage to the original United States flag and the original 13 colonies.
D. longicephala, for instance, responds to the kairomones released by the insect predator N. glauca with the formation of a distinct dorsal crest, a larger body size at primiparity (carrying of the first brood in the brood pouch) and delayed maturity12 (see supplementary material Fig. S1 for comparison of induced (predator exposed) and non-induced (control) D. longicephala).
Corythosaurus started developing its crest when half the size of adults, but Parasaurolophus juveniles grew crests when only 25% as long as adults.
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