Do echidnas live in nests

A female echidna lays her egg directly into a pouch on her abdomen.

During breeding season, the female develops a rudimentary pouch which is really just a flap of skin. When it comes time to lay her egg, she curls tightly into a ball and lays it directly in this pouch, where it is incubated for around 10 days. The young emerge blind and hairless, and stay in the pouch, suckling for two to three months. The young echidna is transferred to a burrow when it begins to develop sppines.