Re: platypuses
I don't know of any exact 4 reasons for the initial rejection by london scientists.but what happened(historically), was that before the discovery of the platypus, there was another similar discovery, that rocked the world of zoologists, of a reptile like animal with mammary glands that turned out to be a fake. So there was much skepticism about the platypus when it was first described. But I'm sure there are no longer any rejections to the characters and existence of the platypus.
The characters that differentiate its uniqueness are as follows:
1)a duck like bill(hence called the duck billed platypus)
2)webbed feet
3)leathery feet, but fur like skin texture(unique to mammals)
4)egg layer(only one of two mammals to do so)
(also eggs are reptile like, with lotsa yolk)
5)a spike at the cloacal opening, fertilization is also cloacal
But what characterises it as a mammal are the mammary glands it possesses, that its young ones suckle on. This is the truly distinguishing ammalian character.
|