Extra Ordinary Birds - Wildlife Birds Conservation Documentary (Mobile Video)

Birds (class Aves or clade Avialae) are feathered, winged, two-legged, warm-blooded, egg-laying animals. Modern birds are characterised by feathers, a beak without any teeth, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a light in weight but strong skeletal system. Extant birds have a lot more or much less industrialized wings; one of the most current species without wings was the moa, which is typically considered to have ended up being extinct in the 16th century. Wings are evolved forelimbs, and most bird species could fly. Flightless birds include ratites, penguins, and varied native island species. Some species of birds, particularly penguins and participants of the Anatidae family, are adjusted to swimming. Birds likewise have respiratory and intestinal systems that are distinctly adapted for trip. Some birds, especially parrots and corvids, are between the most smart animal species; many bird species make and utilize tools, and several social species culturally transmit knowledge across generations.
Lots of species annually shift country miles, and much more do shorter uneven movements. Birds are social, communicating with visual signals, calls, and tunes, and participating in such social behaviours as participating breeding and hunting, gathering, and mobbing of predators. The huge majority of bird species are socially monogamous, normally for one breeding season each time, in some cases for many years, but hardly ever forever. Other species have polygynous ("numerous females") or, hardly ever, polyandrous ("numerous males") breeding systems. Eggs are often laid in a nest and incubated by the moms and dads. Most birds have an extensive period of parental treatment after hatching.
The highest bird diversity takes place in tropical areas. Several households of birds have adjusted to life both on the world's oceans and in them, with some seabird species coming ashore simply to breed and some penguins have actually been tape-recorded diving up to 300 metres (980 feet).