Eurasian river otter (Lutra lutra). Otters in western Scotland have adapted well to life in a marine environment, though proximity to sources of fresh water is essential. Hebrides, Scotland

Eurasian river otter (Lutra lutra). Otters in western Scotland have adapted well to life in a marine environment, though proximity to sources of fresh water is essential. Hebrides, Scotland

Eurasian river otter (Lutra lutra) in the marine environment to which they have adapted so successfully. Hebrides, Scotland.

Eurasian river otter (Lutra lutra) eating a male lumpsucker (Cyclopterus lumpus) fish, also known as a sea hen or scarclagger. Hebrides, Scotland

Eurasian river otter (Lutra lutra). With her only cub nearby, this mother is displaying great alertness. Hebrides, Scotland

Eurasian river otter (Lutra lutra). Hebrides, Scotland

Eurasian river otter (Lutra lutra) eating fish, long-spined bullhead (Taurulus bubalis). Hebrides, Scotland

Eurasian river otter (Lutra lutra) foraging in and among the seaweed. Otters on Scotland's west coast and islands have adapted well to making a living in the marine environment. Hebrides, Scotland

Eurasian river otter (Lutra lutra) foraging in and among the seaweed. Otters on Scotland's west coast and islands have adapted well to making a living in the marine environment. Hebrides, Scotland

Pair of Eurasian river otters (Lutra lutra) foraging in and among the seaweed. Otters on Scotland's west coast and islands have adapted well to making a living in the marine environment. Hebrides, Scotland

Eurasian river otter (Lutra lutra) having caught Greater spotted dogfish (Scyliorhinus stellaris). The otter took only the innards of the dogfish by opening a short section of skin behind the pectoral fin (see images under 'Greater spotted dogfish'). The

Eurasian river otter (Lutra lutra) mother and cub. Cubs often have darker fur than their mothers and for the first few months are much more 'buoyant' in the water. Hebrides, Scotland

Eurasian river otter (Lutra lutra) eating crab. Hebrides, Scotland