Wasps

Close-up of a wasp with black and yellow markings on its body, wings, and legs, perched on a white surface.

Wasps are fiercely territorial and will attack anyone that gets near their nest. Social wasps use a pheromone to call other wasps when they feel threatened. Wasp stings can cause a severe allergic reaction known as anaphylaxis. Enough wasp stings can kill a person, whether or not they're allergic.