jancancook
Nombre de messages : 237 Age : 38 Localisation : Viet Nam Date d'inscription : 15/02/2011
| Sujet: Bird Mer 9 Mar - 13:55 | |
| Birds (class Aves) are feathered, winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals. There are around 10,000 living species, making them the most speciose class of tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic. Extant birds range in size from the 5 cm (2 in) Bee Hummingbird to the 2.75 m (9 ft) Ostrich. The fossil record indicates that birds evolved from theropod dinosaurs during the Jurassic period, around 150–200 Ma (million years ago), and the earliest known bird is the Late Jurassic Archaeopteryx, c 150–145 Ma. Most paleontologists regard birds as the only clade of dinosaurs to have survived the Cretaceous–Tertiary extinction event approximately 65.5 Ma. New Orleans SaintsTooth Implants Preston | |
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XREDXR
Nombre de messages : 308 Age : 29 Localisation : Viet Nam Date d'inscription : 07/02/2011
| Sujet: Re: Bird Ven 19 Aoû - 7:48 | |
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