A cheetah is carnivorous and eats a variety of small animals. While most cats are nocturnal predators, the cheetah is primarily diurnal, hunting in early morning and late afternoon. Since it depends on sight rather than smell, it likes to scan the countryside from a tree limb or the top of a termite mound. Other big cats chase only a few hundred meters: the cheetah chases 5.5 kilometers at an average speed of 72 kilometers per hour. Stalking is as important as the fast sprint: usually it will creep within 46 meters of an intended victim before the final acceleration. Full sprints last about 20 seconds and almost never exceed 1 full minute. If it succeeds in catching an animal the cheetah will suffocate it by clamping the animal's windpipe, sometimes holding a clamp as long as 5 minutes. Very small animals like hares are killed by a simple bite through the skull. But whatever the meal - large or small - cheetah eats quickly for if challenged it will most often lose. Cheetahs have unusually clean eating habits: they do not return to their kill nor do they eat carrion; they leave the skin, bones and entrails of their prey. At 6 weeks the young are strong enough to follow the hunt and when they are about 6 months old the mother will capture live prey for them to practice killing.