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.
How to Identify Parrots. There are certain characteristics which set parrots apart from other birds. These include an upper mandible which can move independently from the rest of the skull, and a zygodactyl toe configuration, with two toes pointing forward and two pointing backward on each foot. Other birds may have one of these features but only parrots have both.