Birds Wiki - What is the birds?
Birds, also known as Aves, are a group of endothermic vertebrates, 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 cm (2 in) bee hummingbird to the 2.75 m (9 ft) ostrich. They rank as the world's most numerically-successful class of tetrapods, with approximately ten thousand living species, more than half of these being passerines, sometimes known as perching birds. Birds have wings which are more or less developed depending on the species; the only known groups without wings are the extinct moa and elephant birds. Wings, which evolved from forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in flightless birds, including ratites, penguins, and diverse endemic island species of birds. 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. Reverse genetic engineering and the fossil record both demonstrate that birds are modern feathered dinosaurs, having evolved from earlier feathered dinosaurs within the theropod group, which are traditionally placed within the saurischian dinosaurs. The closest living relatives of birds are the crocodilians. Primitive bird-like dinosaurs that lie outside class Aves proper, in the broader group Avialae, have been found dating back to the mid-Jurassic period, around 170 million years ago. Many of these early "stem-birds", such as Archaeopteryx, were not yet capable of fully powered flight, and many retained primitive characteristics like toothy jaws in place of beaks, and long bony tails. DNA-based evidence finds that birds diversified dramatically around the time of the Cretaceous–Palaeogene extinction event 66 million years ago, which killed off the pterosaurs and all the non-avian dinosaur lineages. But birds, especially those in the southern continents, survived this event and then migrated to other parts of the world while diversifying during periods of global cooling. This makes them the sole surviving dinosaurs according to cladistics.Some birds, especially corvids and parrots, are among the most intelligent animals; several bird species make and use tools, and many social species pass on knowledge across generations, which is considered a form of culture. Many species annually migrate great distances. Birds are social, communicating with visual signals, calls, and bird songs, and participating in such social behaviours as cooperative breeding and hunting, flocking, and mobbing of predators. The vast majority of bird species are socially monogamous (referring to social living arrangement, distinct from genetic monogamy), usually for one breeding season at a time, sometimes for years, but rarely for life. Other species have breeding systems that are polygynous (arrangement of one male with many females) or, rarely, polyandrous (arrangement of 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. Some birds, such as hens, lay eggs even when not fertilised, though unfertilised eggs do not produce offspring. Many species of birds are economically important as food for human consumption and raw material in manufacturing, with domesticated and undomesticated birds (poultry and game) 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 prominently figure throughout human culture. About 120–130 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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Definitions of "birds"
- Plural form of bird. noun
The word "birds" in example sentences
Roaming about in the woods with hatchet in hand, like a backwoodsman, followed by a troop of dogs; starting up of birds, snakes, hares and foxes, and examining the various kinds of trees, flowers, and birds nests, was at least, a change from the monotonous drag and pull on shipboard.. [Chapter XIX. The Sandwich Islanders-Hide-Curing-Wood-Cutting-Rattle-Snakes-New-Comers]
I could also give several instances of various birds which have been known occasionally to lay their eggs in other birds nests.. [VIII. Instinct. Special Instincts]
This summer, when you have made friends with these wild birds, and they have let you see their homes and learn their secrets, you will make up your mind that there are no _common birds_; for every one of them has something very uncommon about it, '. [Citizen Bird Scenes from Bird-Life in Plain English for Beginners]
(that young birds, _as a rule_, pair together), and it is to some extent supported by the celebrated American observer, Wilson, who strongly insists on the variety in the nests of birds of the same species, some being so much better finished than others; and he believes _that the less perfect nests are built by the younger, the more perfect by the older, birds_.. [Contributions to the Theory of Natural Selection A Series of Essays]
Over the highest of the birds is the place where angels float and gather the children's souls as they are set free.. [Mopsa the Fairy]
When I was 10, it escalated to him taking it into his own hands that he needed to teach me about what he called the birds and the bees.. [Boston.com Top Stories]
I think as long as they use barbless hooks and wet their hands before they handle 'em, hookin 'birds' d be a good sport!. [Skeet Fishing]
And face it, killing pretty cooing birds is always going to get a way worse reaction in a telephone survey than killing nasty, scraggly, filthy ole pigs.. [Poll Shows Iowans Oppose Dove Hunting]
Golfing Sportsman, The introduction of birds is one I've thought about, too.. [The Deadly Sins of Dog Training?]
You will need to somehow show that the experiments showing direct correlation of ddt levels in birds to the thickness and strength of their egg shells was invalid.. [Thoughts on Lead Bans]
That whole sierra gorda area, los Misiones, is a place well worth visiting especially for people interested in birds, history and hiking.. [life in San Joaquin, Queretaro??]
A supply of "eggs, chicks, slaughtered pullets (cooled and frozen) as well as live birds" is being sought, according to the contracting office notice requesting information from interested parties.. [U.S. considers chicken-raising in Afghanistan]
An estimated 3,000 to 5,000 birds were affected, and James and Elaine had seen photos of dead birds from the spill.. [Subhankar Banerjee: Youth Across North America Are Fighting For Their Future Climate]
Yes | No | Report from bigjake wrote 9 weeks 1 day ago dogs that bark at incoming birds is a big nono.. [What Are the Biggest Duck Blind Sins a Gun Dog Can Make?]
Obviously, breaking after downed birds is not going to be an issue in that situation.. [What Are the Biggest Duck Blind Sins a Gun Dog Can Make?]
On close in birds I noticed very little difference.. [Should Non-Toxic Shot Be Mandatory for Doves?]
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