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(eXtra Info about
BIRDS) |
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Bird WatchingMany species of bird undertake long distance annual migrations, and many more perform shorter irregular
movements. Birds are social and communicate using visual signals and through calls and song, and participate in social behaviours
including cooperative hunting, cooperative breeding, flocking and mobbing of predators. The vast majority of bird species are
socially monogamous, usually one breeding season at a time, sometimes for years, and rarely for life. Other species have breeding
systems that are polygynous ("many females") or, rarely, polyandrous ("many males"). Among some monogamous species, extra-pair
copulations are common. Eggs are usually laid in a nest and incubated and most birds have an extended period of parental care
after hatching.
Birds are economically important to humans: many are important sources of food, acquired either through hunting or farming, and they
provide other products. Some species, particularly songbirds and parrots, are popular as pets. Birds figure prominently in all
aspects of human culture from religion to poetry and popular music. About 120-130 species have become extinct as a result of human
activity since 1600, and hundreds more before this. Currently around 1,200 species of birds are threatened with extinction by human
activities and efforts are underway to protect them. |
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