Giraffe up to , and can sustain for several kilometres. A giraffe rests by lying with its body on top of its folded legs. To lie down, the animal kneels on its front legs and then lowers the rest of its body. To get back up, it first gets on its knees and spreads its hind legs to raise its hindquarters. It then straightens its front legs. With each step, the animal swings its head. In captivity, the giraffe sleeps intermittently around 4.6 hours per day, mostly at night. It usually sleeps lying down, however, standing sleeps have been recorded, particularly
Giraffe before "Giraffokeryx". "Samotherium" was a particularly important transitional fossil in the giraffe lineage as its cervical vertebrae was intermediate in length and structure between a modern giraffe and an okapi, and was more vertical than the okapi's. "Bohlinia", which first appeared in southeastern Europe and lived 9–7 mya was likely a direct ancestor of the giraffe. "Bohlinia" closely resembled modern giraffes, having a long neck and legs and similar ossicones and dentition. "Bohlinia" entered China and northern India in response to climate change. From there, the genus "Giraffa" evolved and, around 7 mya, entered Africa. Further climate changes caused the