Little Bird

Birds are feathered, winged, bipedal, egg-laying, vertebrate animals. Around 10,000 living species makes birds the most speciose class of tetrapod vertebrates. The fossil record indicates that birds evolved from the ropod dinosaurs during the period of Jurassic, around 160 million years ago. Around 10,000 living species makes birds the most speciose class of tetrapod vertebrates. Birds inhabit ecosystems over the globe, from the Arctic to the Antarctic. Birds range in size from the 5 cm (2 in) Bee Hummingbirds to the 2.75 m (9 ft) in Ostrich.Paleontologists regard birds is the only clade of dinosaurs to survived the Cretaceous–Paleogene extinction event in 65.5 many years ago.