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 godlewski) , 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)