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Flightless birds are birds that cannot fly. They have, through evolution, lost the ability to fly. [1] There are over 60 extant species, [2] including the well-known ratites (ostriches, emus, cassowaries, rheas, and kiwis) and penguins. The smallest flightless bird is the Inaccessible Island rail (length 12.5 cm, weight 34.7
The bird, like other enantiornithines, didn’t have a digestive organ called a gizzard that helps modern birds crush up their food for easier digestion, “so the evolutionary pressures that led ...
The type species, A. magnificens, is sometimes called the giant teratorn. Argentavis was among the largest flying birds to ever exist, holding the record for heaviest flying bird, although it was surpassed in wingspan after the 2014 description of Pelagornis sandersi, which is estimated to have possessed wings some 20% longer than those of ...
The hoatzin (/ h oʊ ˈ æ t s ɪ n / hoh-AT-sin) [note 1] or hoactzin (/ h oʊ ˈ æ k t s ɪ n / hoh-AKT-sin) (Opisthocomus hoazin) [4] is a species of tropical bird found in swamps, riparian forests, and mangroves of the Amazon and the Orinoco basins in South America.
This article lists living orders and families of birds. In total there are about 10,000 species of birds described worldwide, though one estimate of the real number places it at almost twice that. [1] The order passerines (perching birds) alone accounts for well over 5,000 species.
The largest species of Procellariiformes is the wandering albatross (Diomedea exulans) of the sub-Antarctic oceans, which has the largest wingspan of any living bird. The maximum dimensions of this species are a length of 1.44 m (4.7 ft) and a wingspan of 3.65 m (12.0 ft). [47] Unverified specimens have been reported to measure 5.3 m (17 ft). [42]
The level of divergence is the highest of any genus of birds, being more typical of the divergence between genera or even families. The northern potoo was for a long time considered to be the same species as the common potoo, but the two species have now been separated on the basis of their calls. In spite of this there is no morphological way ...
Known for its ivory-colored bill, black-and-white markings (the males also sport red), and ability to grow larger than a crow, the last confirmed sighting of the North American bird was back in 1944.