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Skull and beak of specimen AMNH 7515. Unlike earlier pterosaurs, such as Rhamphorhynchus and Pterodactylus, Pteranodon had toothless beaks, similar to those of birds. Pteranodon beaks were made of solid, bony margins that projected from the base of the jaws. The beaks were long, slender, and ended in thin, sharp points.
When initially described in 1924 Oviraptor itself was thought to be a member of the Ornithomimidae, popularly known as the "ostrich" dinosaurs, because both taxa share toothless beaks. [1] Early caenagnathid oviraptorosaur discoveries like Caenagnathus itself were also incorrectly classified at the time, having been misidentified as birds. [1]
Members of the group possessed a horny, typically toothless beak, unique amongst all synapsids. Dicynodonts first appeared in Southern Pangaea during the mid-Permian , ca. 270–260 million years ago, and became globally distributed and the dominant herbivorous animals in the Late Permian , ca. 260–252 Mya.
Oviraptor had toothless jaws that ended in a robust, parrot-like rhamphotheca (horny beak). The curvature of the dentary tip was down-turned but less pronounced than other oviraptorids, such as Citipati. As a whole, the lower jaw is a short and deep bone that covers 19.5 cm (195 mm). [16]
Unlike the earlier pterosaurs, such as the rhamphorhynchids and the pterodactylids, P. sternbergi had a toothless beak that was made of solid, bony margins that projected from the base of the jaws, similar to modern-day birds. The structure of the beaks were long, slender, and ended in thin, sharp points.
It was thought to be the oldest known bird to have a beak, [2] though this title now belongs to an earlier relative Eoconfuciusornis. [3] It was named after the Chinese moral philosopher Confucius (551–479 BC). Confuciusornis is one of the most abundant vertebrates found in the Yixian Formation, and several hundred complete specimens have ...
The monotreme platypus has what looks like a bird's beak (hence its scientific name Ornithorhynchus), but is a mammal. [38] However, it is not structurally similar to a bird beak (or any "true" beak, for that matter), being fleshy instead of keratinous. Red blood cells in mammals lack a cell nucleus.
Its toothless, short beak suggests it was a herbivore or at least an omnivore, unlike most other ceratosaurs except for adult Limusaurus. Because the holotype represents an immature individual, it has been suggested that Berthasaura was herbivorous throughout its entire life, unlike Limusaurus. It was probably less than 1 metre (3.3 ft) long. [1]