Loic Poidevin / Grizzly bear (Ursus arctos horribilis) attempting to catch salmon leaping up rapids, Katmai National Park, Alaska, USA

Loic Poidevin / Salmon landing on head of Grizzly bear (Ursus arctos horribilis) as it is leaping up rapids, Katmai National Park, Alaska, USA

Rob Jordan / 2020VISION / Atlantic salmon (Salmo salar) leaping up the cauld at Philphaugh Salmon Viewing Centre near Selkirk, where members of the public can view the spectacle, Selkirkshire, Scotland, UK, October 2011

Rob Jordan / 2020VISION / Captured Atlantic salmon (Salmo salar) awaiting tagging by Tweed Foundation staff monitoring fish movement, density and biology, River Tweed, Berwickshire, Scotland, UK, September

Laurie Campbell / Two Atlantic salmon (Salmo salar) acending waterfall to reach spawning beds, Perthshire, Scotland, November

Todd Mintz / Sockeye salmon (Oncorhynchus nerka) split level view of salmon on river bed, annual spawning run, Adams River, British Columbia, Canada, October

Todd Mintz / Sockeye salmon (Oncorhynchus nerka) split level view of annual spawning run, Adams River, British Columbia, Canada, October

Todd Mintz / Sockeye salmon (Oncorhynchus nerka) split level view of annual spawning run, Adams River, British Columbia, Canada, October

Matthew Maran / Chinook Salmon (Oncorhynchus tshawytscha) leaping through water surface in front of forested coastline. Vancouver Island, British Columbia, Canada, September.

Andy Rouse / Grizzly bear (Ursus arctos horribilis) leaping through water chasing salmon, Katmai NP, Alaska, USA, September, (01360399 is a crop of this image)

Andy Rouse / Grizzly bear (Ursus arctos horribilis) leaping through water chasing salmon, Katmai NP, Alaska, USA, September, (crop of image 01360394) Not available for ringtone/wallpaper use.

Matthew Maran / Black Bear (Ursus americanus) with a Chinook Salmon (Oncorhynchus tshawytscha) in its mouth. Ucluth Inlet, Barkley Sound, Vancouver Island, Canada, September.