Bird (Fallout: New Vegas)
location: Mojave Wasteland
They are black, and can be found eating the floor. They can be killed, but you have to be quick, or they'll fly away, and keep a short distance away from it too. The only mutation they have is large size. Killing one on the ground will cause a fountain of blood to appear in the birds place and their legs are stuck in the ground. Killing one awards you 1 XP!