The Springwatch team are joined by fieldcraft experts Simon King and Charlie Hamilton James for an in-depth view of one of the UK's most charismatic yet enigmatic animals - the otter.
On a calm day in the Shetlands Isles, Simon King finds an otter hunting in clear water.
Living not only along our rivers but also at the coast, otters have remarkable adaptations to a life both in and out of water. The team bring you the very latest scientific discoveries as well as a review of the turbulent history of the otter in the UK. It looks like the otter is making a steady comeback around the country but not everybody agrees this is good news.
And there's more clips from Springwatch Guide Otters.