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The bird's average length is 26–28 cm (10–11 in), with a wingspan of 35–40 cm (14–16 in). They have relatively short, rounded wings and long, featherless legs. These birds are easily recognized by their topknots, which are shorter in the female and change color with the seasons and geographic location of particular populations.
Birds with eyes on the sides of their heads have a wide visual field, while birds with eyes on the front of their heads, such as owls, have binocular vision and can estimate the depth of field. [ 122 ] [ 123 ] The avian ear lacks external pinnae but is covered by feathers, although in some birds, such as the Asio , Bubo and Otus owls , these ...
Download as PDF; Printable version; In other projects ... In this list of birds by common name 11,278 extant and recently extinct (since 1500) bird ...
Birds (class Aves) – winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals. There are around 10,000 living species, making them the most varied of tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic, to the Antarctic.
It is otherwise a basically grey bird, with a pinkish breast. The wingspan can range from 68 to 80 cm (27 to 31 in) and the wing chord measures 24 to 25.4 cm ( 9 + 1 ⁄ 2 to 10 in). The tail measures 13.8 to 15 cm ( 5 + 1 ⁄ 2 to 6 in), the bill is 1.9 to 2.2 cm ( 3 ⁄ 4 to 7 ⁄ 8 in) and the tarsus is 2.5 to 2.8 cm (1 to 1 + 1 ⁄ 8 in). [ 8 ]
For species found in the 50 states, Puerto Rico, and the U.S. Virgin Islands, the taxonomic treatment (designation and sequence of orders, families and species) and nomenclature (common and scientific names) used in the list are those of the AOS, the recognized scientific authority on the taxonomy and nomenclature of North and Middle American birds.