Snowy-Browed Flycatcher
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High Quality Content by WIKIPEDIA articles! Birds (class Aves) are winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals. There are around 10,000 living species, making them the most varied 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…mehr

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High Quality Content by WIKIPEDIA articles! Birds (class Aves) are winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals. There are around 10,000 living species, making them the most varied 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.