Do platypus have bones on the outside of their body?

No, platypuses do not have bones on the outside of their body. They have a skeleton just like other mammals, with bones located inside their bodies.

The platypus is known for its unique features, including its duck-like bill, webbed feet, and venomous spurs on its hind legs, but these are not bones. The bill is made of cartilage, the feet are supported by bones, and the spurs contain a venom gland.