The mollusc family has some quite odd members, but Tropidophera Cuvierana may take the prize for the oddest. This curious creature has a very unusual ridged shell, a distinctly strange eye placement and, remarkably, two pseudopods instead of the single foot you find on most snails. Once thought extinct, T. Cuvierana was rediscovered recently and seems to be doing fine, although very little is known about it.