Nick Hawkins / Chum salmon (Oncorhynchus keta) migrate up a small river near Bella Bella, British Columbia, Canada. September

Bryan and Cherry Alexander / Nivkhi fisherman retrieving Chum salmon (Oncorhynchus keta) from net at sunset. Niva Bay, Sakhalin Island, Russian Far East, 2006.

Michel Roggo / Chum / Dog Salmon (Oncorhynchus keta) in resting pool on migration upstream to spawn, Weaver Creek, British Columbia, Canada, 1989

Doug Gimesy / Platypus researcher holding a platypus (Ornithorhynchus anatinus) which was captured as part of a Melbourne Water study to monitor the local population. Chum Creek, Healsville, Victoria, Australia. Ma...

Doug Gimesy / Platypus researcher holding a platypus (Ornithorhynchus anatinus) whilst field assistant measures the bill length. It was captured as part of a Melbourne Water study to monitor the local population. C...

Doug Gimesy / Platypus researchers holding a Platypus (Ornithorhynchus anatinus) and measuring bill length. It was captured as part of a Melbourne Water study to monitor the local population. Chum Creek, Healsville...

Doug Gimesy / Platypus researcher retrieving a platypus (Ornithorhynchus anatinus) from a net that was set up just 1 hour earlier to capture and help monitor the local population. Chum Creek, Healsville, Victoria,...

Doug Gimesy / Platypus ecologist returning a male platypus (Ornithorhynchus anatinus) to a creek where it had been captured just 30 minutes earlier. Chum Creek, Healsville, Victoria, Australia. May 2017.Model rele...

Doug Gimesy / Researcher placing a piece of platypus tissue (Ornithorhynchus anatinus) into a vial. From this piece, the DNA will be analysed back in the lab to help compare differences that may exist between popu...

Doug Gimesy / Platypus researcher holding a platypus (Ornithorhynchus anatinus) whilst field assistant measured bill length. It was captured as part of a Melbourne Water study to monitor the local population. Chum...

Doug Gimesy / Platypus researchers holding a platypus (Ornithorhynchus anatinus) whilst field assistant measures the bill length. It was captured as part of a Melbourne Water study to monitor the local population....

Doug Gimesy / Platypus researchers holding a Platypus (Ornithorhynchus anatinus) which was captured as part of a Melbourne Water study to monitor the local population. Chum Creek, Healsville, Victoria, Australia. M...

Doug Gimesy / Platypus researchers taking a small skin sample is from the webbing between the toes of a Platypus (Ornithorhynchus anatinus). Chum Creek, Healsville, Victoria, Australia. May, 2017.Model released.

Doug Gimesy / Platypus researchers measuring the bill length of a Platypus (Ornithorhynchus anatinus) which was captured as part of a Melbourne Water study to monitor the local population. Chum Creek, Healsville, V...

Nick Hawkins / Chum salmon (Oncorhynchus keta) migrating to spawn in a small river near Bella Bella, British Columbia, Canada. September.

Nick Hawkins / Chum salmon (Oncorhynchus keta) migrating to spawn in a small river near Bella Bella, British Columbia, Canada. September.

Nick Hawkins / Chum salmon male (Oncorhynchus keta) migrating to spawn in a small river. Eggs visible near bottom of frame. Bella Bella, British Columbia, Canada. September.

Nick Hawkins / Chum salmon male (Oncorhynchus keta) migrating up a small river near Bella Bella, British Columbia, Canada. September.

Doug Gimesy / Platypus researchers holding a Platypus (Ornithorhynchus anatinus) which was captured as part of a Melbourne Water study to monitor the local population. Chum Creek, Healsville, Victoria, Australia. M...

Doc White / Mass of Chum salmon (Oncorhynchus keta), many spawning. Southeast Alaska, USA. July.

Doc White / Mass of Chum salmon (Oncorhynchus keta), many spawning. Southeast Alaska, USA. July.

Doc White / Mass of Chum salmon (Oncorhynchus keta), many spawning. Southeast Alaska, USA. July.

Doc White / Chum salmon (Oncorhynchus keta). Southeast Alaska, USA. July.

Doug Gimesy / Platypus researcher retrieves a platypus (Ornithorhynchus anatinus) from a net that was set up to capture and help monitor the local population. Chum Creek, Healsville, Victoria, Australia. May, 201...

David Fleetham / Chum barrel used as bait on Great White Shark expedition on "Solmar V", off Guadalupe Island, Mexico.

Gerrit Vyn / Bald eagle (Haliaeetus leucocephalus) feeding on spawning chum salmon. Southeast Alaska. December.

Gerrit Vyn / Bald eagle (Haliaeetus leucocephalus) feeding on spawning chum salmon. Southeast Alaska. December.

Gerrit Vyn / Bald eagle (Haliaeetus leucocephalus) feeding on spawning chum salmon. Southeast Alaska. December.

Gerrit Vyn / Bald eagle (Haliaeetus leucocephalus) feeding on spawning chum salmon. Southeast Alaska. December.

Gerrit Vyn / Bald Eagle (Haliaeetus leucocephalus) feeding on spawning chum salmon. Southeast Alaska. December.

Charlie Summers / Black bear (Ursus americanus) struggling with a large Chum salmon fish (Oncorhynchus keta) as it tries to escape. Passage of Alaska, Neets Bay, Alaska, USA, July.

Aflo / Chum salmon (Oncorhynchus keta) in river for spawning, Kawakami, Hokkaido, Japan, October.

Aflo / Chum salmon (Oncorhynchus keta) in river for spawning, Kawakami, Hokkaido, Japan, October.

Oliver Scholey / Grizzly bear (Ursus arctos horribilis) carrying Chum salmon (Oncorhynchus keta) Katmai National Park, Alaska, USA, August.

Oliver Scholey / Grizzly bear (Ursus arctos horribilis) with Chum salmon (Oncorhynchus keta) Katmai National Park, Alaska, USA, August.

Mary McDonald / Black bear (Ursus americanus) sow with caught chum/dog salmon (Oncorhynchus keta), Kake Village, Kuprenof Island, SE Alaska, USA. August.

Mary McDonald / Black bear (Ursus americanus) spring cub eating chum/dog salmon (Oncorhynchus keta), Kake Village, Kuprenof Island, SE Alaska, USA. August.

Mary McDonald / Black bear (Ursus americanus) spring cub eating chum/dog salmon (Oncorhynchus keta), Kake Village, Kuprenof Island, SE Alaska, USA. August.

Bryan and Cherry Alexander / Zhenya Stoyanova, a Chukchi woman, removes a Chum salmon from her fishing net in Anadyr Bay, Anadyr, Chukotka, Siberia, Russia. July 2013.

Bryan and Cherry Alexander / Zhenya Stoyanova, a Chukchi woman, removes a Chum salmon from her fishing net in Anadyr Bay, Anadyr, Chukotka, Siberia, Russia. July 2013.

Bryan and Cherry Alexander / Zhenya Stoyanova, a Chukchi woman, removes a Chum salmon from her fishing net in Anadyr Bay, Anadyr, Chukotka, Siberia, Russia. July 2013.

Bryan and Cherry Alexander / Zhenya Stoyanova, a Chukchi woman, holds up a Chum salmon she has caught in Anadyr Bay, Anadyr, Chukotka, Siberia, Russia. July 2013.

Nick Garbutt / Dead Pink Salmon (Oncorhynchus gorbuscha) and Chum Salmon (Oncorhynchus keta), in log jam. Salmon Bay, Great Bear Rainforest, British Columbia, Canada, October.

Hiroya Minakuchi / Chum Salmon (Oncorhynchus keta) pair migrating up river to spawning grounds, Prince William Sound, Alaska

Hiroya Minakuchi / Chum Salmon (Oncorhynchus keta) group spawning, Prince William Sound, Alaska

Mark Carwardine / Firing chum slick into the water as bait for Great white shark cage-diving, Guadalupe Island, Mexico (North Pacific)

Charlie Summers / Black bear (Ursus americanus) with Dog salmon (Oncorhynchus keta) catch. Note the teeth the male Dog / Chum Salmon grows during the spawning season. Alaska, USA, July

Mike Read / Wandering albatross (Diomedia exulans), Cape pigeon (Daption capense) and Northern giant petrel (Macronectes halli) on sea feeding on chum, Kaikoura, New Zealand

Mike Read / Wandering albatross (Diomedia exulans), Cape pigeon (Daption capense) and Northern giant petrel (Macronectes halli) on sea feeding on chum, Kaikoura, New Zealand

Doug Perrine / Courtship of Chum / Dog / Silverbrite / Keta salmon (Oncorhynchus keta) in spawning stream, female in center, males on left and right, Sheep Bay, Prince William Sound, Alaska, USA, July

Doug Perrine / Male Chum / Dog / Silverbrite / Keta salmon (Oncorhynchus keta) in spawning stream, Bear Trap, Port Gravina, Prince William Sound, Alaska, USA, July

Doug Perrine / Courtship of Chum / Dog / Silverbrite / Keta salmon (Oncorhynchus keta) in spawning stream, female in center, males on left and right, Sheep Bay, Prince William Sound, Alaska, USA, July

Doug Perrine / Female Chum / Dog / Silverbrite / Keta salmon (Oncorhynchus keta) in spawning stream, body decomposing in preparation for death after spawning, Bear Trap, Port Gravina, Prince William Sound, Alaska, U...

Doug Perrine / Chum / Dog / Silverbrite / Keta salmon (Oncorhynchus keta) in spawning stream, Bear Trap, Port Gravina, Prince William Sound, Alaska, USA, July

Doug Perrine / Female or immature male Chum / Dog / Silverbrite / Keta salmon (Oncorhynchus keta) in spawning stream, Bear Trap, Port Gravina, Prince William Sound, Alaska, USA, July

Bryan and Cherry Alexander / Train near Salekhard commemorating the victims of Stalin's railway from Chum - Labatnyangi - Salekhard - Igarka (501 km). Yamal, NW Siberia, Russia, February 2007.

Matthias Breiter / Bald Eagle (Haliaeetus leucocephalus) with Chum Salmon (Oncorhynchus keta) along Chilkat River, Haines, Alaska

Doc White / Chum salmon (Oncorhynchus keta) swimming upstream to spawn. Alaska, USA

Bryan and Cherry Alexander / Khanty and Forest Nenet Reindeer / Caribou herders constructing their 'Chum' (tent). Khanty Mansiysk, Western Siberia, Russia, 2000.

LYNN M. STONE / Male Grizzly Bear (Ursus arctos horribilis) splashing towards shore with a Chum Salmon caught in McNeil River, Alaska, USA, July

LYNN M. STONE / Grizzly Bear (Ursus arctos horribilis) splashing towards shore with a Chum Salmon caught in McNeil River, Alaska, USA, July (Note orange salmon eggs on bear, on its right eye, and dripping into water)

Hiroya Minakuchi / Chum Salmon (Oncorhynchus keta) alevins, native to the Pacific Ocean

Hiroya Minakuchi / Chum Salmon (Oncorhynchus keta) alevins, native to the Pacific Ocean

Hiroya Minakuchi / Chum Salmon (Oncorhynchus keta) eggs and alevins, native to the Pacific Ocean

Hiroya Minakuchi / Chum Salmon (Oncorhynchus keta) eggs, native to the Pacific Ocean

Hiroya Minakuchi / Chum Salmon (Oncorhynchus keta) eggs, native to the Pacific Ocean

George McCarthy / Grizzly Bear {Ursus arctos horribilis} with caught Chum Salmon, Alaska, USA

George McCarthy / Grizzly Bear (Ursus arctos horribilis) with Chum Salmon (Oncorhynchus keta) Alaska, USA

LYNN M. STONE / Grizzly bear with freshly caught Chum salmon (Ursus arctos horribilis) McNeil river, Alaska, USA

Hiroya Minakuchi / Chum Salmon (Oncorhynchus keta) male in breeding coloration, southeast Alaska

Peter Mather / European Magpie (Pica Pica) trio feeding on Chum Salmon (Oncorhynchus keta) on snow-covered Chilkat River shore, Chilkat Bald Eagle Preserve, Alaska

Peter Mather / Bald Eagle (Haliaeetus leucocephalus) feeding on Chum Salmon (Oncorhynchus keta) carcass on snow-covered Chilkat River shore, Chilkat Bald Eagle Preserve, Alaska

Hiroya Minakuchi / Chum Salmon (Oncorhynchus keta) pair spawning, Prince William Sound, Alaska

Hiroya Minakuchi / Chum Salmon (Oncorhynchus keta) male, Prince William Sound, Alaska

Pete Oxford / Chum bucket for baited shark dive, Umkomaas, Kwazulu Natal, South Africa

Pete Oxford / Black-tip Shark (Carcharhinus limbatus) trio circling chum bucket and diver during baited shark dive, Umkomaas, Kwazulu Natal, South Africa

Nature Production / Close up of Fish scale of Chum / Dog Salmon {Oncorhynchus keta} Japan

LYNN M. STONE / Grizzly bear {Ursus arctos horribilis} fishes for salmon McNeil River Game Sanct Alaska

LYNN M. STONE / Grizzly bear {Ursus arctos horribilis} fishes for salmon McNeil River Game Sanct Alaska

LYNN M. STONE / Grizzly bear {Ursus arctos horribilis} fishes for salmon McNeil River Game Sanct Alaska

Shane Gross / Salmon sharks (Lamna ditropis) swimming, Prince William Sound, Alaska, USA, Pacific Ocean. *Note - Digitally altered image (chum removed)

Magnus Lundgren / Chum salmon (Oncorhynchus keta) swimming for their lives during their epic run up a rapid Alaskan river, Prince William Sound, Alaska, USA. Golden Turtle Wildlife Festival Competition 2021 - Runner up...

Tony Wu / Chum salmon (Oncorhynchus keta) male. Despite his poor condition, the male was still swimming and competing with other males to spawn with females. Hokkaido, Japan.

Tony Wu / Chum salmon (Oncorhynchus keta) male, on his last legs during the spawning run. His body has deteriorated considerably. His eye is opaque. Yet, he was still vying to spawn with females. A more intact...

Tony Wu / Chum salmon (Oncorhynchus keta) swimming in a shallow river, Hokkaido, Japan.