Its tail has a small brain of its own. Beware! If you get close, it may react to your scent and bite.
Its tail, which also contains a small brain, may bite on its own if it notices an alluring smell.
When it is in danger, its tail uses some sort of mysterious powers to drive away the enemy.
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.
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.
— Pokédex entries (via PokeAPI)