Kite is a common name for birds of the family Accipitridae. A
few of the Perninae are also called kites. Birds (class Aves)
are feathered, winged, bipedal, endothermic (warm-blooded), egg-
laying, vertebrate animals. With around 10,000 living species,
they are the most speciose class of tetrapod vertebrates. All
present species belong to the subclass Neornithes, and inhabit
ecosystems across the globe, from the Arctic to the Antarctic.
Extant birds range in size from the 5 cm (2 in) Bee Hummingbird
to the 2.75 m (9 ft) Ostrich. The fossil record indicates that
birds emerged within theropod dinosaurs during the Jurassic
period, around 160 million years (Ma) ago. Paleontologists
regard birds as the only clade of dinosaurs to have survived the
Cretaceous–Paleogene extinction event 65.5 Ma (million years)
ago. Modern birds are characterised by feathers, a beak with no
teeth, the laying of hard-shelled eggs, a high metabolic rate, a
four-chambered heart, and a lightweight but strong skeleton. All
living species of