Kakugo virus is a picorna-like virus found in the brains of worker bees. It is a subtype of Deformed wing virus. The Kakugo (Japanese for 'ready to attack') virus, when resident in a bee's brain, can contribute to aggressive behaviors similar to those preeminent during a bee's guard phase in their life cycle. Kakugo virus is the first virus to be discovered that has been claimed to cause aggressive behavior in honeybees.