Human: What is the difference between a tiger, lion, leopard and cheetah? Assistant: 
The main difference between a tiger, lion, leopard, and cheetah is size. Tigers are the largest of the four species at up to 6 feet in length. Lions are slightly smaller than tigers at around 5-5.5 feet in length. Leopards are slightly larger than lions at around 5.5-6 feet in length. Cheetahs are the smallest of the four species at around 4-4.5 feet in length.