An adorable baby rhino resting in the shade. Rhinos spend their days and nights grazing, only resting during the hottest hours of the day. After birth, a baby rhino can walk within an hour. A rhino is born without a horn, but the front horn becomes visible within one or two months. The back horn starts growing when the calf is about a year old. The calf will stay with its mother for about three years before setting off on its own.