PÁSSARO #2 | If We Were Animals Series

Birds are a class of endothermic vertebrate living beings characterized by the presence of feathers, a toothless beak, rigid shell oviparity, high metabolism, a heart with four chambers and a resistant and light pneumatic skeleton. Birds are present in all regions of the world and vary significantly in size, from the 5 cm of the hummingbird to the 2.75 m of the ostrich. They are the class of tetrapods with the largest number of live species, approximately ten thousand, of which more than half are passerine.