What is the only mammal that lays eggs?

The platypus is a fascinating and unique mammal found in Australia, and it is the only mammal that lays eggs. The platypus is classified as a monotreme, which is a type of mammal that lays eggs instead of giving birth to live young.

The female platypus lays one to three eggs at a time, which she incubates for about ten days before they hatch. The platypus is also unique in that it does not have nipples to feed its young. Instead, the mother produces milk which is secreted through the skin of her abdomen and the young platypuses lap it up.

Another interesting fact about the platypus is that it has several unique features that set it apart from other mammals. It has a duck-like bill, webbed feet, and it is one of the few venomous mammals. The males also have spurs on their hind legs that can deliver a venomous sting.