Birds (Aves)

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. Birds live worldwide and range in size from the 5.5 cm (2.2 in) bee hummingbird to the 2.8 m (9 ft 2 in) ostrich. There are about ten thousand living species, more than half of which are passerine, or "perching" birds. <img src="" width="500"> From [Wikipedia]( under [CC BY-SA 3.0]( license.

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Parent taxon Vertebrates (Vertebrata)
Lower taxa N/A
Related species Great crested grebe (Podiceps cristatus), Eurasian coot (Fulica atra), Hooded crow (Corvus cornix), Common magpie (Pica pica), Short-eared owl (Asio flammeus), Ural owl (Strix uralensis), Black kite (Milvus migrans), Common raven (Corvus corax), Hawfinch (Coccothraustes coccothraustes), Godlewski's bunting (Emberiza godlewskii), Great tit (Parus major), House sparrow (Passer domesticus), Rook (Corvus frugilegus), Rock dove (Columba livia), European herring gull (Larus argentatus), Mongolian gull (Larus vegae mongolicus), Black-headed gull (Chroicocephalus ridibundus), Little grebe (Podiceps ruficollis), Horned grebe (Podiceps auritus), Red-necked grebe (Podiceps grisegena), Common buzzard (Buteo buteo), Great grey shrike (Lanius excubitor), Western marsh harrier (Circus aeruginosus), Wild duck (Anas platyrhynchos), Common pochard (Aythya ferina), Pale sand martin (Riparia diluta)