Summary ²

Birds (Aves) are a group of endothermic vertebrates, 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 cm (2 in) bee hummingbird to the 2.75 m (9 ft) ostrich. They rank as the class of tetrapods with the most living species, at approximately ten thousand, with more than half of these being passerines, sometimes known

Fuentes y créditos

1. (c) Greg Lasley, algunos derechos reservados (CC BY-NC), subido por Greg Lasley
2. (c) Wikipedia, algunos derechos reservados (CC BY-SA), https://en.wikipedia.org/wiki/Aves

Más información

• NaturaLista página del taxón
• Biodiversity Heritage Library
• BOLD Systems BIN search
• change linear sequence of orders to place Galliformes and Anseriformes after Tinamiformes
• Cornell Lab of Ornithology
• Global Biodiversity Information Facility (GBIF)
• VertNet

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