Dead and dying pink salmon (Oncorhynchus gorbuscha) gathering after the spawn just outside of Sitka, Alaska, United States of America

Dead and dying pink salmon (Oncorhynchus gorbuscha) gathering after the spawn just outside of Sitka, Alaska, United States of America

Adult brown bear (Ursus arctos) scratching its back on tree, Brooks River, Katmai National Park near Bristol Bay, Alaska, United States of America

Leaping pink salmon (Oncorhynchus gorbuscha) gathering to spawn at Lake Eva on Chichagof Island, Alaska, United States of America, North America

Dead and dying pink salmon (Oncorhynchus gorbuscha) gathering to spawn just outside of Sitka, Southeast Alaska, United States of America, North America

Pink salmons (Oncorhynchus gorbuscha) swim densely packed upstream on their way to spawning grounds, Prince William Sound, Alaska, USA, North America

Moor Frog (Rana arvalis) in spawning grounds at sunset, Middle Elbe Biosphere Reserve near Dessau, Saxony-Anhalt, Germany, Europe

Moor frog (Rana arvalis), male in the spawning grounds, Mittlere Elbe biosphere reserve on the Elbe river near Dessau, Saxony-Anhalt, Germany, Europe

Pink salmon (Oncorhynchus gorbuscha) jumping up a waterfall on their way to spawning grounds, Prince William Sound, Alaska, USA, North America

Atlantic Salmon adults migrate from salt water of North Atlantic Ocean upstream through freshwater of their natal river to reach spawning grounds, Exploits River, Newfoundland

Atlantic Salmon adults leap up Falls while Migrating upstream to Spawning Grounds, Humber River, Newfoundland

Atlantic Salmon adult leaps up Falls Migrating Upstream to Spawning Grounds, Humber River, Newfoundland

Atlantic Salmon adults migrate from salt water of North Atlantic Ocean upstream through freshwater of their natal river to reach spawning grounds, Exploits River, Newfoundland

Atlantic Salmon adults leap up Falls while Migrating upstream to Spawning Grounds, Humber River, Newfoundland

Atlantic Salmon adult leaps up Falls Migrating Upstream to Spawning Grounds, Humber River, Newfoundland

European Frog mating, France

Quinnock salmon spawning in a mountain river, New Zealand

Sockeye Salmons near the bank, Kuril Lake Kamchatka Russia

Kuril Lake Kamchatka Russia

Sockeye Salmons, Kuril Lake Kamchatka Russia

Sockeye Salmons, Kuril Lake Kamchatka Russia