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.
All birdsâfrom wrens to ostriches to owls to penguinsâhave certain. characteristics in common. â¢ Birds are vertebrates. â¢ Birds have lungs to breathe air. â¢ Birds are warm-blooded, meaning they keep their body at a constant temperature. â¢ Birds lay eggs, from which their young hatch. â¢ Birds have feathers.