Girafarig's rear head contains a tiny brain that is too small for thinking. However, the rear head doesn't need to sleep, so it can keep watch over its surroundings 24 hours a day.
Girafarig's rear head also has a brain, but it is small. The rear head attacks in response to smells and sounds. Approaching this Pokémon from behind can cause the rear head to suddenly lash out and bite.