Outline of birds

The following outline is provided as an overview of and topical guide to birds: Birds (class Aves) – winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals.

There are around 10,000 living species, making them the most varied of tetrapod vertebrates.

They inhabit ecosystems across the globe, from the Arctic, to the Antarctic.

Extant birds range in size from the 5 cm (2 in) bee hummingbird to the 2.75 m (9 ft) ostrich.

A bird can be described as all of the following: Bird Bird anatomy Bird behavior Aviculture List of ornithologists

House sparrow , Passer domesticus
Cladogram showing the most recent classification of Neoaves, based on several phylogenetic studies
External anatomy (topography) of a typical bird: 1 Beak, 2 Head, 3 Iris, 4 Pupil, 5 Mantle, 6 Lesser coverts, 7 Scapulars, 8 Coverts, 9 Tertials, 10 Rump , 11 Primaries, 12 Vent, 13 Thigh, 14 Tibio-tarsal articulation, 15 Tarsus, 16 Feet, 17 Tibia, 18 Belly, 19 Flanks, 20 Breast, 21 Throat, 22 Wattle , 23 Eyestripe