The Echidna (also known as the Spiny Anteater) is a primitive egg-laying mammal that lives in Australia and New Guinea. This solitary, burrowing animal has tough spines covering the top of its body. The echidna lives for over 50 years in captivity. When attacked, the echidna will quickly burrow in the ground or curl up in a ball. It is a solitary creature and minds its own business.
Egg-laying mammals are called monotremes. There are only three monotremes in the world: the long-beaked echidna, short-beaked echidna, and duck-billed platypus.
Male echidnas have a four-headed penis.