Echidna (Tachyglossus aculeatus)
The echidna is one of only two kinds of egg-laying mammals, or monotremes, in the world. A female echidna lays a single egg directly into her pouch, and the hatchling breaks out after about 10 days. It suckles milk from skin patches on the mother’s belly for three months. The echidna’s body is covered with sharp spines—a special kind of hair that stands on end when the animal is threatened.