Rattlesnake

Rattlesnakes are venomous snakes that form the genera Crotalus and Sistrurus of the subfamily Crotalinae. All rattlesnakes are vipers. Rattlesnakes are predators that live in a wide array of habitats, hunting small animals such as birds and rodents. Wikipedia
Speed: Sidewinder: 29 km/h
Mass: Crotalus durissus: 1.2 kg Encyclopedia of Life
Class: Reptilia
Family: Viperidae
Kingdom: Animalia
Order: Squamata