There are two species of rhinos, the black and the white. Both species are extremely rare, with the black one being the rarest, and tend to prefer living alone or in pairs. Their habitat varies from dense forest to open scrub where they feed on the leaves of bushes and trees. What they lack in good eyesight they more than compensate for with excellent sense of smell and hearing. Their lifespan is 35 to 40 years and they weigh up to 2 tons. Both the black and white rhino have two horns, the longer of which sits at the front of the nose. The closest rhino relationship is between a female and her calf, lasting from 2 to 4 years.