Surf's up!

'Spy dolphin' takes a close look at dolphins at play...

- NATASHA HOLT

SPY IN THE OCEAN 

Sunday, 7pm, BBC1 Factual

As a pod of dolphins surf the ocean waves, it's clear that they're having fun and enjoying the shared experience. But on closer inspection, one of the group is slightly different from the rest.

It is, of course, 'spy dolphin', and in the second episode of this series, narrated by David Tennant, it infiltrates the pod to gain valuable insights into dolphins' innermost feelings.