Rare footage has emerged from South Africa showing a normally herbivorous giraffe chewing on the bones of another animal.<br /><br />The surprising moment, which was captured by wildlife photographer Ewan Wilson at Schotia Game Reserve back in November, shows the adult herbivore rolling a bone around in its mouth. <br /><br />According to experts, feeding on bones provides giraffes with the calcium and phosphorus they need for their own skeletons. <br /><br />A 2013 study published in the Journal of Archaeological Science found that it's not just bones giraffes feed on. The herbivorous mammals also regularly consume antlers, horns, and ivory.<br /><br />This behaviour is called osteophagia.
