Platypus
Xian-sheng,the most primitive and exotic mammalian species.Only distributed in eastern Australia between Cape York to South Australia,in Tasmania is also habitat.
Platypus Features
Australia's single-hole type mammals,the most peculiar to the number of platypus.The so-called monotreme means that in reptiles and mammals the middle of an animal.Even though it's more than reptiles progress,but have not yet evolved into mammals.Both have in common is to use pulmonary respiration,hairy body,and is the blood; and egg-laying monotreme Youyi breeding methods,it retains the key features of reptiles.Although it has been included in mammals,but do not have the full features of mammals.The lowest level is the most primitive mammals,in animal taxonomy called "the original mammal," or egg-laying mammals known as monotremes.