Charlie Hamilton James first met Diablo when the giant otter was only six months old. Now he's sailing back into the heart of the Amazon rainforest to catch up with his old friend. Diablo's now 6ft long and a daddy to a familty of otter cubs, all of whom need swimming lessons. Teaching these unruly little critters how to swim would be easy if the river wasn't crawling with killer creatures. Hilton James is on hand with a couple of cameras to capture all of the adorable and dramatic action as it unfolds.