A wildlife sanctuary in South Africa shared video of an unusual friendship struck up between two orphans -- a baby rhino and a baby hippo.

The video, filmed at the Helping Rhinos sanctuary, shows 6-month-old rhinoceros Ntoto and 18-month-old hippopotamus Charlie rubbing their noses together affectionately.

The sanctuary said Ntoto and Charlie have become close friends and playmates.

Officials said Ntoto's mother was killed by poachers, while Charlie was rescued after a drought made his mother unable to care for him.