FusionDex

Nidowag play an important role in pond ecosystems, feeding on toxic algae that would otherwise build up in the stagnant water. They incorporate the toxins into their body, coating themselves in a slimy, poisonous film to deter predators.

It is possible to see this Pokémon's spiral innards right through its thin skin. The male Nidoran has developed muscles that freely move its ears in any direction.