Erythropoiesis (from Greek 'erythro' meaning red and 'poiesis' meaning to make) is the process which produces red blood cells (erythrocytes).
Birds and mammals have the following characteristics in common: they are vertebrates, meaning they have an internal skeletonthey are warm-bloodedthey breathe using lungs, so â¦ have full respiratory systems they have circulatory systems. Most mammals give live birth, but there is a sub-group known as monotremes, which are the egg-laying mammals. 2  This group includes just the platypus and the echidna. 3  They are still mammals because, like all mammals, they feed their young on mothers' milk.
Though, like most birds, are capable of flight, bats are mammals. In fact they are the only mammals that are capable of flight. For one thing bats have mammary glands, fur, give live birth and feed their young on milk. Birds on other hand have feathers. Birds are the only animals to have feathers. Bats are covered in fur. Though both bats and rodents are mammals they are completely different orders. Bats are in an order to their own. For one thing bats don't have gnawing teeth. Most bats feed on insects.