Birds Around Us
Last Revision
Saturday,
14 February 2016
Birds are feathered, winged, warm-blooded, egg-laying, vertebrate animals. Around 10,000 living species makes them the most speciose class of tetrapod (4-limbs) vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic. Birds range in size from the 5 cm to the 2.75 m. Birds live and breed in most terrestrial habitats and on all continents, reaching their southern extreme in the breeding colonies up to 440 km inland in Antarctica. The highest bird diversity occurs in tropical regions.