Hippo calf helped to the surface by mother to breathe

A cute video has emerged of a mother hippo pushing her baby to the surface of the water in their enclosure at San Diego Zoo, CA, USA.

The footage, shot in 2011, shows the baby letting its mother push him with her head to the surface so he can breathe.

"Mom got so exhausted chasing baby around that she held him in her jaw for 20 minutes just so she could have a nap!" the filmer wrote online.