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Il y a 1 jour · Birds are a group of warm-blooded vertebrates constituting the class Aves ( / ˈeɪviːz / ), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.
- Neoaves
Neoaves is a clade that consists of all modern birds...
- Neoaves
Il y a 3 jours · The brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. It consists of nervous tissue and is typically located in the head ( cephalization ), usually near organs for special senses such as vision, hearing and olfaction.
Il y a 4 jours · Feather variations. Feathers are epidermal growths that form a distinctive outer covering, or plumage, on both avian (bird) and some non-avian dinosaurs and other archosaurs. They are the most complex integumentary structures found in vertebrates [1] [2] and a premier example of a complex evolutionary novelty. [3]
Il y a 2 jours · Squamata ( / skwæˈmeɪtə /, Latin squamatus, 'scaly, having scales') is the largest order of reptiles, comprising lizards and snakes. With over 12162 Species, [2] it is also the second-largest order of extant (living) vertebrates, after the perciform fish.
Il y a 2 jours · Chelonia Ross and Macartney 1802. Turtles, or testudines, are reptiles of the order Testudines, characterized by a special shell developed mainly from their ribs. Modern turtles are divided into two major groups, the Pleurodira (side necked turtles) and Cryptodira (hidden necked turtles), which differ in the way the head retracts.
Il y a 1 jour · Cavin et al. (2024) describe fossil material of a large-bodied ray-finned fish from a Lower Triassic outcrop in northern Dobrogea ( Romania ), with anatomy interpreted as indicative of affinities with Polzbergiidae, and interpret the studied fossils as belonging to the earliest known large, specialized, durophagous neopterygian.
Il y a 10 heures · Salamandroidea. Native distribution of salamanders (in green) Salamanders are a group of amphibians typically characterized by their lizard -like appearance, with slender bodies, blunt snouts, short limbs projecting at right angles to the body, and the presence of a tail in both larvae and adults. All ten extant salamander families are grouped ...
