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.
A bird is not a mammal. Birds do not give birth to already living young, they fertilize and lay eggs. Also, birds do not feed their young milk (when they hatch) which is anoth â¦ er primary trait that must be present in order for them to be classified as a mammal.hey are birds. mammals are covered with hair and give live birth and feed them from mammary glands (cows, people, cats, dogs, horses, etc). birds lay eggs and feed their youn â¦ g with bugs and worms.