In the penultimate episode, the year is drawing to a close and the Scottish Highlands will soon go into lockdown as winter brings a world of snow and ice.

Animals of the region are frantically making preparations for the darkest, coldest season, which will mean a test of endurance and resilience for most of the wildlife.

As the red squirrel collects and stores nuts to see her through to the spring and Atlantic salmon head upstream for the spawning season, grey seals in the Orkney Isles are displaying signs of some deeply worrying behaviour…