Platypus Lays Eggs. The uniqueness of the platypus makes it a. Females usually lay two eggs at a time, but sometimes they lay one egg or three.
It is one of only two mammals known to do so, the other being the echidna.
Baby platypuses hatch after 10 days and nurse for up to four months before they swim off and forage. It's thought that at one time most mammals lay eggs, and in this way the female platypuses lay only one or two eggs at a time and keep them warm by incubating them. When a baby platypus emerges from its shell, it's about the size of a lima bean. Monotremes are the only mammals that lay eggs.
