Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. Birds live worldwide and range in size from the 5.5 cm (2.2 in) bee hummingbird to the 2.8 m (9 ft 2 in) ostrich. There are about ten thousand living species, more than half of which are passerine, or "perching" birds. Birds have wings whose development varies according to species; the only known groups without wings are the extinct moa and elephant birds. Wings, which are modified forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in some birds, including ratites, penguins, and diverse endemic island species. The digestive and respiratory systems of birds are also uniquely adapted for flight. Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further evolved for swimming.
Birds are feathered theropod dinosaurs and constitute the only known living dinosaurs. Likewise, birds are considered reptiles in the modern cladistic sense of the term, and their closest living relatives are the crocodilians. Birds are descendants of the primitive avialans (whose members include Archaeopteryx) which first appeared about 160 million years ago (mya) in China. According to DNA evidence, modern birds (Neornithes) evolved in the Middle to Late Cretaceous, and diversified dramatically around the time of the Cretaceous–Paleogene extinction event 66 mya, which killed off the pterosaurs and all non-avian dinosaurs.Many social species pass on knowledge across generations, which is considered a form of culture. Birds are social, communicating with visual signals, calls, and songs, and participating in such behaviours as cooperative breeding and hunting, flocking, and mobbing of predators. The vast majority of bird species are socially (but not necessarily sexually) monogamous, usually for one breeding season at a time, sometimes for years, and rarely for life. Other species have breeding systems that are polygynous (one male with many females) or, rarely, polyandrous (one female with many males). Birds produce offspring by laying eggs which are fertilised through sexual reproduction. They are usually laid in a nest and incubated by the parents. Most birds have an extended period of parental care after hatching.
Many species of birds are economically important as food for human consumption and raw material in manufacturing, with domesticated and undomesticated birds being important sources of eggs, meat, and feathers. Songbirds, parrots, and other species are popular as pets. Guano (bird excrement) is harvested for use as a fertiliser. Birds figure throughout human culture. About 120 to 130 species have become extinct due to human activity since the 17th century, and hundreds more before then. Human activity threatens about 1,200 bird species with extinction, though efforts are underway to protect them. Recreational birdwatching is an important part of the ecotourism industry.

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    Parang iba lasa

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    Most animals: teaches their kids how to walk gently Birds:
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    Trivia There's a bird that has "evolved" back into existence twice

    There's a bird that has "evolved" back into existence twice The Aldabra white-throated rail may not be a very well known bird, but it's certainly a remarkable one. The flightless creature first found itself in trouble around 136,000 years ago when it went extinct—something it's done twice...
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    Trivia Most Common Bird on Earth

    The red-billed quelea is the most common bird on Earth There may not be any red-billed queleas in your neighborhood, but that's not because there isn't an abundance of them. These birds, which live in sub-Saharan Africa, are considered agricultural pests because their massive flocks can...
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    What's the difference between kinky and perverted? . . Kinky is when you tickle your girlfriend with a feather, . . . Perverted is when you use the whole bird.
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    Help Bird flu

    May bird flu po ba talaga ngayon kase nagpadala po yung mama ko ng native na manok at atchara pero sabi daw po ng driver hinarang daw po kase may bird flu
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    Looking For LF this bird.

    Hanap ako gantong ibong Palawan Mynah 🥲
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    Closed Flappy Bird App

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    Closed Bird baks

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    Closed Nakakita ka na ng ibon na ang paa ay nasa taas?

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    Closed English speaking si father

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    Closed Bird of priest

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    Closed Hi

    ask lang pano mag alaga ng kalapate tnx
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    Help Game Extension

    Wha about you guys gonna put an Extension were we members can play on it. Like Flappy bird etc. Members hit "LIKE" nalang po kung nagustohan nyo Suggestion ko. Kung may e-susugest kayo o hindi kayo sang-ayun sa Suggestion ko feel free to Reply to this Thread po. :)