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.
Birds have a lot in common with reptiles, such as turtles, crocodiles, and lizards. Scientists theorize that birds and reptiles are old relatives, and have many shared traits. For example, both birds and reptiles: 1  lay eggs. 2  have similar eyes and brain. 3  have similar skull and ear bones. 4  have partially hollow bones.