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Top 15 Most Popular Bird Species in North America

birds Jump to navigation Jump to search For other uses, see  Bird (disambiguation)  and  Birds (disambiguation) . "Aves" and "Avifauna" redirect here. For other uses, see  Aves (disambiguation)  and  Avifauna (disambiguation) . Birds Temporal range: Early Cretaceous  ( Aptian ) –  Present , [1]  121–0 Mya   PreЄ Є O S D C P T J K Pg N Scientific classification Kingdom: Animalia Phylum: Chordata Clade : Sauropsida Clade : Avemetatarsalia Clade : Ornithurae Class: Aves Linnaeus ,  1758 [2] Extant  orders  and temporal range show See orders Synonyms Neornithes  Gadow, 1883 Birds  are a group of  warm-blooded   vertebrates  constituting the  class   Aves , characterized 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 cm (2 in)  bee hummingbird  to the 2.75 m (9 ft)  ostrich . There are about ten thousand
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