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) common 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.
Birds are warm-blooded vertebrates characterized by their feathers, beaked jaws, laying of hard-shelled eggs, and ability to fly (although not all bird species are capable of sustained flight). They are members of the class Aves, and exhibit a wide variety of physical features, sizes, diets, and adaptations depending on their specific species. Birds are found in various habitats all over the world and play important ecological roles such as pollination, seed dispersal, and pest control.
Birds is the third solo album by New Zealand artist Bic Runga, released in New Zealand and Ireland on 28 November 2005. The "Limited Australian Tour Edition" was released in Australia on 4 March 2006. Release is the United Kingdom is expected to be on 15 May. Birds was the New Zealand Herald's 2005 album of the year, and was Bic's third #1 album chart entry in New Zealand, garnering platinum status in its first week. It went to double platinum by the end of its second week, and has been certified triple platinum thus far. RIANZ ranked Birds as 20th in the New Zealand Top 50 Albums of 2005 even though it has only charted for five weeks—from its release until the end of the year. Birds entered the Australian charts at position 26 on the week ending 13 March 2006. It peaked at #20 in the Irish and Dutch Charts respectively. The album was mixed in London with the help of Simon Gogerly.
U.S. National Library of Medicine
Warm-blooded VERTEBRATES possessing FEATHERS and belonging to the class Aves.
Plural noun of bird.
There are a variety of birds that come into our garden every day, we are so grateful to see them, the sounds they make bring such joy to our hearts.
Submitted by MaryC on February 14, 2016
Song lyrics by birds -- Explore a large variety of song lyrics performed by birds on the Lyrics.com website.
British National Corpus
Spoken Corpus Frequency
Rank popularity for the word 'birds' in Spoken Corpus Frequency: #1837
Written Corpus Frequency
Rank popularity for the word 'birds' in Written Corpus Frequency: #2335
The numerical value of birds in Chaldean Numerology is: 3
The numerical value of birds in Pythagorean Numerology is: 7
One good example is the way we usually collect birds. You put up a mist net, then play male bird calls to attract other birds, these will mostly be males trying to defend their territories. Although it is studied far less frequently, female birds also call. So maybe using female calls too might help.
Did you ever see an unhappy horse? Did you ever see bird that had the blues? One reason why birds and horses are not unhappy is because they are not trying to impress other birds and horses.
Birds Save The Environment We Save The Birds. ... Respected Dear All On Earth !
One must ask children and birds how cherries and strawberries taste.
Birds, especially pet birds, do suffer from pulmonary infection. Birds are dinosaurs, and dinosaurs presented, most likely, a birdlike lung system, i would expect dinosaurs to suffer from similar pulmonary infections as in birds. Of course, Covid is a novel disease, we can not know if something similar happened in the past, so we can't say if dinosaurs suffered from Covid-like diseases.
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