A pair of short-clawed otters are up to no good in this second episode of the fly-on-the-wall series.

Wallace and Annie share an enclosure with pregnant babirusa (a kind of Indonesian pig-deer) Kendari.

While she tries to settle down to give birth, the pair throw stones at her shelter, so there’s no choice but to move them in with the orangutans.

Young male Willie sees this as his chance to impress the ladies and puts the otters in their place.