Giraffe pelvis, though relatively short, has an ilium that is outspread at the upper ends. A giraffe has only two gaits: walking and galloping. Walking is done by moving the legs on one side of the body at the same time, then doing the same on the other side. When galloping, the hind legs move around the front legs before the latter move forward, and the tail will curl up. The animal relies on the forward and backward motions of its head and neck to maintain balance and the counter momentum while galloping. The giraffe can reach a sprint speed of
Giraffe living giraffes consist of multiple species. The researchers suggested the existence of four species, which have not exchanged genetic information between each other for 1 million to 2 million years. Those four species are the northern giraffe ("G. camelopardalis"), southern giraffe ("G. giraffa"), reticulated giraffe ("G. reticulata"), and Masai giraffe ("G. tippelskirchi"). Since then, a response to this publication has been published, highlighting seven problems in data interpretation, and concludes "the conclusions should not be accepted unconditionally". In 2016 there were an estimated 90,000 individuals of "Giraffa" in the wild. In 2010 there were more than 1,600 in captivity at