Nick Hawkins / Atlantic salmon (Salmon salar) under river ice. Quebec, Canada. October.

Nick Hawkins / Atlantic salmon (Salmo salar) migrating for spawning in river, Gaspe Peninsula, Quebec, Canada, October.

Nick Hawkins / Two Atlantic salmon (Salmo salar) silhouetted against sky, Gaspe Peninsula, Quebec, Canada, October.

Michel Roggo / Atlantic salmon (Salmo salar) migrating upstream to spawn, Quebec, Canada Photographed for the Freshwater Project.

SCOTLAND: The Big Picture / Atlantic salmon (Salmo salar) leaping up a small waterfall in order to reach breeding grounds further upstream, Cairngorms National Park, Scotland, UK, October.

Ann & Steve Toon / Atlantic salmon (Salmo salar) leaping on upstream migration, River Tyne, Hexham, Northumberland, UK, November

Matthias Breiter / Black Bear (Ursus americanus) with Pink Salmon (Oncorhynchus gorbuscha) prey, Anan Creek, Tongass National Forest, Alaska

Matthias Breiter / Black Bear (Ursus americanus) with Pink Salmon (Oncorhynchus gorbuscha) prey, Anan Creek, Tongass National Forest, Alaska

Will Watson / Atlantic salmon (Salmo salar) leaping a weir, Shrewsbury, River Severn, Shropshire, England, UK. November.

Charlie Summers / Black Bear (Ursus americanus) with Pink Salmon (Oncorhynchus gorbuscha) catch, Anan Creek, Alaska, July.

Charlie Summers / Black Bear (Ursus americanus) hunting for spawning Salmon during low tide, Neets Creek estuary, Alaska, July.

Mark Carwardine / Black bear (Ursus americanus) catching salmon, Princess Royal Island, the Great Bear Rainforest, British Columbia, western Canada