Join 69,228 users and earn money for participation

Birds..

5 8 boost
Avatar for Prodyut
Written by   118
10 months ago

Birds are a group of warm-blooded vertebrates constituting the class Aves, characterized 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. 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 evolved from forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in some birds, including ratitespenguins, 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
Temporal range:
Early Cretaceous (Aptian) – Present,[1] 121–0 Ma PreꞒOSDCPTJKPgNScientific classificationKingdom:AnimaliaPhylum:ChordataClade:SauropsidaClade:AvemetatarsaliaClade:OrnithuraeClass:Aves
Linnaeus1758[2]Extant orders and temporal rangeSee orders* Infraclass Palaeognathae

5
$ 0.00
Avatar for Prodyut
Written by   118
10 months ago
Enjoyed this article?  Earn Bitcoin Cash by sharing it! Explain
...and you will also help the author collect more tips.

Comments

Nice article

$ 0.00
10 months ago
So informative artical well writing dear carry on
$ 0.00
10 months ago

Birds are very beautiful creature of god. Your articles is full of very important information about birds. This article is enough to know about birds. Thanks a lot for sharing this useful article.waiting for your next article.

$ 0.00
10 months ago

Nice article

$ 0.00
10 months ago