Echidna n. : A monster, half maid and half serpent.

Echidna n. : A genus of Monotremata found in Australia, Tasmania, and New Guinea. They are toothless and covered with spines; -- called also porcupine ant-eater, and Australian ant-eater.

Example:
Where and how can I buy an Echidna in sydney?

Taxonomy
Echidna, species, Zaglossus, Tachyglossidae, genus, snout, Australia, free encyclopedia, genus Tachyglossus, genus Zaglossus, Short-beaked Echidna, ants, termites, puggle, family, monotremes, mammals, Megalibgwilia.

Defination from the web:
... SC Nicol, NA Andersen, NH Phillips, RJ Berger (2000-02-11), "The echidna manifests typical characteristics of rapid eye movement sleep", Neuroscience letters ...