Rare white rhino calf frolics with parents

He already weighs in at more than 200 kilograms but baby rhino Humphrey still has plenty of growing ahead of him.

The four-month-old white rhinoceros has recently joined the rest of his family, known as a "crash", at Australia Zoo in the Sunshine Coast hinterland.

"We're really happy with his progress as he continues to grow up a happy, active and quite social calf," zookeeper Manu Ludden said.

The endangered white rhino is the second largest land mammal after the elephant, with adult males weighing up to 3,600 kilograms.