Birds & Mammals

The natural environment comprises all naturally occurring surroundings and conditions in which living things grow and interact on earth.Birds , also known as avian dinosaurs live worldwide and range in size from the 5 cm (2 in) bee hummingbirds to the 2.75 m ostrich. Mammals are any vertebrates within the class Mammalia, distinguished from reptiles and birds by the possession of a neocortex, hair, three middle ear bones and mammary glands



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