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Aves can mean the last common ancestor of all the currently living birds and all of its descendants (a "crown group", in this sense synonymous with Neornithes) Under the fourth definition Archaeopteryx , traditionally considered one of the earliest members of Aves, is removed from this group, becoming a non-avian dinosaur instead.
List of bird genera concerns the chordata class of aves or birds, characterised by feathers, a beak with no teeth, the laying of hard-shelled eggs, and a high metabolic rate. Restless flycatcher in the downstroke of flapping flight
Phylogenetically, Aves is usually defined as all descendants of the most recent common ancestor of a specific modern bird species (such as the house sparrow, Passer domesticus), and either Archaeopteryx, [2] or some prehistoric species closer to Neornithes (to avoid the problems caused by the unclear relationships of Archaeopteryx to other ...
Class Aves, divided into superorders, orders, suborders (where indicated), and families. Paleognathae Struthioniformes : mainly southern hemisphere; 12 species, 2 extinct
The Palaeognathae or "old jaws" is one of the two superorders recognized within the taxonomic class Aves and consist of the ratites and tinamous. The ratites are mostly large and long-legged, flightless birds, lacking a keeled sternum. Traditionally, all the ratites were place in the order Struthioniformes.
Palaeognathae (/ ˌ p æ l i ˈ ɒ ɡ n ə θ i /; from Ancient Greek παλαιός (palaiós) 'old' and γνάθος (gnáthos) 'jaw') is an infraclass of birds, called paleognaths or palaeognaths, within the class Aves of the clade Archosauria. It is one of the two extant infraclasses of birds, the other being Neognathae, both of which form ...
The Accipitridae (/ ˌ æ k s ɪ ˈ p ɪ t r ɪ d iː,-d eɪ /) is one of the four families within the order Accipitriformes, [2] and is a family of small to large birds of prey with strongly hooked bills and variable morphology based on diet.
Linnaeus described the class Aves as: A beautiful and cheerful portion of created nature consisting of animals having a body covered with feathers and down; protracted and naked jaws (the beak), two wings formed for flight, and two feet.