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Birds have one of the most complex respiratory systems of all animal groups. [77] Upon inhalation, 75% of the fresh air bypasses the lungs and flows directly into a posterior air sac which extends from the lungs and connects with air spaces in the bones and fills them with air. The other 25% of the air goes directly into the lungs.
In this list of birds by common name 11,278 extant and recently extinct (since 1500) bird species are recognised. [1] Species marked with a "†" are extinct.
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Eagle photos Archived 6 June 2012 at the Wayback Machine on Oriental Bird Images; Eagle videos on the Internet Bird Collection; Web of the Conservation Biology Team-Bonelli's Eagle, of the University of Barcelona; Decorah Eagles: 24/7 Live Webcam from The Raptor Resource Project Archived 1 March 2012 at the Wayback Machine
In total there are about 11,000 species of birds described as of 2024, [1] though one estimate of the real number places it at almost 20,000. [2] The order passerines (perching birds) alone accounts for well over 5,000 species.
A vulture is a bird of prey that scavenges on carrion.There are 23 extant species of vulture (including condors). [2] Old World vultures include 16 living species native to Europe, Africa, and Asia; New World vultures are restricted to North and South America and consist of seven identified species, all belonging to the Cathartidae family.
Shrikes are passerine birds known for their habit of catching other birds and small animals and impaling the uneaten portions of their bodies on thorns. A shrike's beak is hooked, like that of a typical bird of prey. Brown shrike, Lanius cristatus (C) LC; Red-backed shrike, Lanius collurio (A) LC; Loggerhead shrike, Lanius ludovicianus NT