Aves (Birds)

Birds (class Aves) are feathered, winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals. Around 10,000 living species makes 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 Bee Hummingbird to the 2.75 m Ostrich.
The fossil record indicates that birds evolved from feathered theropod (? maniraptor) dinosaurs during the Jurassic period, around 160 million years (Ma) ago. Some paleontologists and biologists regard birds as the only clade of dinosaurs to have survived the Cretaceous–Paleogene extinction event 65.5 Ma ago.

Source: http://en.wikipedia.org/wiki/Aves

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Anas

Inv. no.	ČB467
Taxonomy	Kmen: Chordata / Třída: Aves / Rod: Anas
Description
Locality	Sokolov - důl JIří List ofxhibits on this locality

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Anas

Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]