6. Echidna
Weirdness factor: The echidna is an evolutionary mashup—it has a pouch for its young like a kangaroo, spines like a porcupine, and a sticky tongue like an anteater. Oh, and it lays eggs like a chicken. See it in: Tasmania, Australia, and New Guinea (and the Cleveland Metroparks Zoo, which has a short-beaked echidna).
