Echidnas, sometimes known as spiny anteaters, are a type of egg-laying mammal. The four extant species, together with the platypus, are the only surviving members of that order and are the only extant mammals that lay eggs. Although their diet consists largely of ants and termites, they are no more closely related to the true anteaters of the Americas than to any other placental mammal. They live in Australia and New Guinea. The echidnas are named after a monster in ancient Greek mythology.
The elusive short beaked echidna looks a bit like a walking sea urchin with a beak. It also has a pouch like that of a marsupial and lays eggs like a reptile. Even more amazing is the fact that is has the lifespan of an elephant!