It is a mammal
The platypus is not a reptile - it is an egg-laying mammal.
Platypus eggs are soft and leathery, rather than hard-shelled.
platypus
Both the dolphin and platypus are mammals for one very simple reason: they both suckle their young on mothers' milk. this is one of the defining charactersitics of mammals.because dolphins spend all their time in the water, it is difficult to conceive that it is a mammal, and that it could suckle its young on mothers' milk. And the platypus is often wrongly thought of as a reptile or a bird because it lays eggs. Its misnomer "duckbilled platypus" has a large part to play, too. Its bill is a different shape and has a very different function to that of a duck.
If you mean the "platypus," no, it is not a bird. It is a mammal.
The platypus has fur, not feathers.
A red robin is not a reptile; it is a bird.
A budgerigar is a bird.
No. A hen is a bird.
No. A platypus is a semi-aquatic mammal that lays eggs.
Quite simply, the platypus is a mammal, not a bird. It has fur instead of feathers, and it feeds its young on mothers' milk.
No, an ostrich is a member a of the bird family. How could it be a reptile?