Giant otters and piranhas in Peru

This 22 July 2018 BBC video says about itself:

Giant otters love fishing and eating piranha – but how do they catch them without being bitten?

Giant otters are one of the toughest creatures in the Amazon jungle. Not only are they living in a lake in the middle of the Peruvian Amazon, but they are also surrounded by three hundred black caiman, anaconda, jaguar and puma. Diablo the giant otter also has six unruly pups to keep from harm, and educate in the ways of the jungle. This otter dad certainly has his paws full. Leading wildlife cameraman Charlie Hamilton-James follows the family in their remarkable location over the course of a whole season, through their ups, downs, and the start of a new generation of otters.