Andy Rouse / Bengal tiger (Panthera tigris tigris) with tourists watching from cars, Ranthambore, India

David Pattyn / Dalmatian pelicans (Pelecanus crispus) fighting for fish. Lake Kerkini, Greece. February. Vulnerable species.

Denis-Huot / Young Lioness (Panthera leo) chasing Giraffe (Giraffa camelopardalis) Masai-Mara game reserve, Kenya.

Mike Wilkes / Carrion crows (Corvus corone) harassing Buzzard (Buteo buteo) trying to steal its prey, Warwickshire, England, UK, March

Nick Upton / Avocet (Recurvirostra avosetta) harassing Common / Eurasian crane (Grus grus) 'Sedge' and her chick near the Avocet's nest site in marshland pool, Slimbridge, Gloucestershire, UK, June 201...

Winfried Wisniewski / Cape Vulture (Gyps coprotheres) mobbed by White-necked Raven (Corvus albicollis), Giant's Castle National Park, KwaZulu-Natal, South Africa

Winfried Wisniewski / Cape Vulture (Gyps coprotheres) mobbed by White-necked Raven (Corvus albicollis), Giant's Castle National Park, KwaZulu-Natal, South Africa

Winfried Wisniewski / Cape Vulture (Gyps coprotheres) mobbed by White-necked Ravens (Corvus albicollis), Giant's Castle National Park, KwaZulu-Natal, South Africa

Winfried Wisniewski / Cape Vulture (Gyps coprotheres) mobbed by White-necked Ravens (Corvus albicollis), Giant's Castle National Park, KwaZulu-Natal, South Africa

Huw Cordey / Wild dogs (Lycaon pictus), harassing spotted hyena, (Crocuta crocuta) Liuwa Plains National Park, Zambia.

Huw Cordey / Wild dogs (Lycaon pictus), harassing spotted hyena (Crocuta crocuta), Liuwa Plains National Park, Zambia.

Huw Cordey / Wild dogs (Lycaon pictus), harassing spotted hyena (Crocuta crocuta), Liuwa Plains National Park, Zambia.

Andrew Parkinson / Brown hare (Lepus europaeus) two males chasing female in snow covered field during a blizzard. Derbyshire, England, UK, February. Winner of British Seasons category of BWPA competition 2014.

Mike Wilkes / Carrion crows (Corvus corone) harassing Buzzard (Buteo buteo) with prey, Warwickshire, England, UK, March

Mike Wilkes / Carrion crows (Corvus corone) harassing Buzzard (Buteo buteo) with prey, Warwickshire, England, UK, March

Mike Wilkes / Carrion crows (Corvus corone) harassing Buzzard (Buteo buteo) with prey, Warwickshire, England, UK, March

Mike Wilkes / Carrion crows (Corvus corone) harassing Buzzard (Buteo buteo) with prey, Warwickshire, England, UK, March

Mike Wilkes / Carrion crows (Corvus corone) harassing Buzzard (Buteo buteo) with prey, Warwickshire, England, UK, March

Mike Wilkes / Carrion crows (Corvus corone) harassing Buzzard (Buteo buteo) with prey, Warwickshire, England, UK, March

Lou Coetzer / Marabou stork (Leptoptilos crumeniferus) harassing a juvenile African fish eagle (Haliaeetus vocifer) Chobe River, Botswana, November.

Kevin Schafer / Adelie Penguin (Pygoscelis adeliae) group harassing a creche of youngsters, Brown Bluff, Antarctic Peninsula, Antarctica

Steve Gettle / Magnificent Frigatebird (Fregata magnificens) male stealing food from Red-billed Tropicbird (Phaethon aethereus), Galapagos Islands, Ecuador

Suzi Eszterhas / Sea Otter (Enhydra lutris) bachelor male harassing female with pup, Monterey Bay, California

Suzi Eszterhas / Sea Otter (Enhydra lutris) bachelor male harassing female with pup, Monterey Bay, California

Suzi Eszterhas / Sea Otter (Enhydra lutris) bachelor male harassing female with pup, Monterey Bay, California

Suzi Eszterhas / Sea Otter (Enhydra lutris) bachelor male harassing female with pup, Monterey Bay, California

Suzi Eszterhas / Sea Otter (Enhydra lutris) mother attacking bachelor male who was harassing her and her three to six month old pup, Monterey Bay, California

Suzi Eszterhas / Sea Otter (Enhydra lutris) bachelor male chasing mother with three to six month old pup, Monterey Bay, California

Suzi Eszterhas / Sea Otter (Enhydra lutris) bachelor male chasing mother with three to six month old pup, Monterey Bay, California

Suzi Eszterhas / Sea Otter (Enhydra lutris) bachelor male chasing mother with three to six month old pup, Monterey Bay, California

Matthias Breiter / Polar Bear (Ursus maritimus) harassed by Arctic Tern (Sterna paradisaea) defending nest, Hudson Bay, Canada

Jan Vermeer / Gentoo Penguin (Pygoscelis papua) chicks harassing parent for food, Hannah Point, Antarctica

Bruno D'Amicis / Hooded crow (Corvus corone cornix) harassing Common buzzard (Buteo buteo) white morph, by pulling its tail feathers. Germany

Keith Scholey / African wild dogs {Lycaon pictus} harassing Cobra, Masai Mara GR, Kenya

Anup Shah / Two cheetah harassing Spotted hyaena {Crocuta crocuta} Kenya.

Anup Shah / Cheetah {Acinonyx jubatus} harassing Spotted hyaena {Crocuta crocuta} Kenya

Flip Nicklin / Beluga (Delphinapterus leucas) whales harassing a Bowhead Whale (Balaena mysticetus), Baffin Island, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) harassing Bowhead Whale (Balaena mysticetus), Lancaster Sound, Canada

Flip Nicklin / Beluga (Delphinapterus leucas) harassing Bowhead Whale (Balaena mysticetus), Lancaster Sound, Canada

Tui De Roy / Galapagos Sea Lion (Zalophus wollebaeki) pup playfully harassing Marine Iguana (Amblyrhynchus cristatus), Hood Island, Galapagos Islands, Ecuador

Cyril Ruoso / Chacma Baboon (Papio ursinus) stealing mango from shopper, Cape Town, South Africa. Sequence 4 of 6

Cyril Ruoso / Chacma Baboon (Papio ursinus) with stolen mango and rhubarb, Cape Town, South Africa. Sequence 6 of 6

Cyril Ruoso / Chacma Baboon (Papio ursinus) approaches shopper, Cape Town, South Africa. Sequence 1 of 6

Duncan Usher / Carrion Crow (Corvus corone) harassing Common Buzzard (Buteo buteo) while feeding on carrion, Germany

Steve Gettle / Magnificent Frigatebird (Fregata magnificens) male stealing food from Red-billed Tropicbird (Phaethon aethereus), Galapagos Islands, Ecuador

Tui De Roy / Nazca Booby (Sula granti) fledgling chick harassing incubating Frigatebird, Genovesa Tower Island, Galapagos Islands, Ecuador

Ashley Cooper / Springer spaniel swimming in Lake Windermere chasing a Mute swan (Cygnus olor) Ambleside, Lake District, Cumbria, UK. April.

Ashley Cooper / Springer spaniel swimming in Lake Windermere chasing a Mute swan (Cygnus olor) Ambleside, Lake District, Cumbria, UK. April.

Ashley Cooper / Springer spaniel swimming in Lake Windermere chasing a Mute swan (Cygnus olor) Ambleside, Lake District, Cumbria, UK. April.

David Tipling / Great frigatebird (Fregata minor) in flight pirating a Masked booby (Sula dactylatra), harassing the Booby from below until it regurgitates its fish to escape, Cosmoledo Atoll Aldabra group, Seychelle...

David Tipling / Great frigatebird (Fregata minor) in flight, harassing a Masked booby (Sula dactylatra). The Great frigate bird catches fish regurgitated by Masked booby as it escapes, Cosmoledo Atoll Aldabra group,...

David Tipling / Great frigatebird (Fregata minor) in flight, harassing a Masked booby (Sula dactylatra). The Great frigate bird catches fish regurgitated by Masked booby as it escapes, Cosmoledo Atoll Aldabra group,...

David Tipling / Great frigatebird (Fregata minor) in flight, harassing a Masked booby (Sula dactylatra). The Great frigate bird catches fish regurgitated by Masked booby as it escapes, Cosmoledo Atoll, Seychelles.

David Tipling / Masked booby (Sula dactylatra) in flight, regurgitating fish to escape an attacking Great frigatebird (Fregata minor), Cosmoledo Atoll, Seychelles.

David Tipling / Flock of Great frigatebirds (Fregata minor) in flight pirating a Masked booby (Sula dactylatra). Frigatebirds harrassing the Booby from below until it eventually regurgitates its fish to escape, Cosmo...

David Tipling / Great frigatebird (Fregata minor) in flight, pirating a Masked booby (Sula dactylatra), Cosmoledo Atoll, Seychelles.

David Tipling / RF - Flock of Great frigatebirds (Fregata minor) in flight pirating a Masked booby (Sula dactylatra). Frigatebirds harrassing the Booby from below until it eventually regurgitates its fish to escape,...

David Tipling / RF - Two Great frigatebirds (Fregata minor) in flight pirating a Masked booby (Sula dactylatra). Frigatebirds harrassing the Booby from below until it eventually regurgitates its fish to escape, Cosmo...

David Tipling / RF - Great frigatebird (Fregata minor) in flight, pirating a Masked booby (Sula dactylatra), Cosmoledo Atoll, Seychelles. (This image may be licensed either as rights managed or royalty free.)

David Tipling / RF - Great frigatebird (Fregata minor) in flight, harassing a Masked booby (Sula dactylatra). The Great frigate bird catching fish regurgitated by Masked booby as it escapes, Cosmoledo Atoll, Seychell...

David Tipling / RF - Great frigatebird (Fregata minor) in flight, pirating a Masked booby (Sula dactylatra). The Great frigate bird catching fish regurgitated by Masked booby as it escapes, Cosmoledo Atoll, Seychelle...

David Tipling / Great frigatebird (Fregata minor) in flight, harassing a Masked booby (Sula dactylatra). The Great frigate bird catches fish regurgitated by Masked booby as it escapes, Cosmoledo Atoll, Seychelles.

David Tipling / RF - Great frigatebird (Fregata minor) in flight, harassing a Masked booby (Sula dactylatra), Cosmoledo Atoll, Seychelles.(This image may be licensed either as rights managed or royalty free.)

Tui De Roy / Pair of Green turtle (Chelonia mydas) mating offshore, harassed by other males. Colola Beach, Michoacan state, Mexico. Pacific Ocean.

Tui De Roy / Pair of Green turtles (Chelonia mydas) mating offshore, harassed by another eager male. Colola Beach, Michoacan state, Mexico. Pacific Ocean.

Tui De Roy / Pair of Green turtles (Chelonia mydas) mating offshore, harassed by other eager males. Colola Beach, Michoacan state, Mexico. Pacific Ocean.

Tui De Roy / Pair of Green turtles (Chelonia mydas) mating offshore, harassed by other eager males. Colola Beach, Michoacan state, Mexico. Pacific Ocean.

Roman Willi / Common toad (Bufo bufo) attempting to grab onto pair of Common frogs (Rana temporaria) in amplexus, Lucerne, Switzerland. March. Focus stacked.

Charlie Hamilton-James / Five Cheetah (Acinonyx jubatus) male siblings, completely surrounded by tourist vehicles, Masai Mara, Kenya, Africa.

David Fleetham / Green sea turtle (Chelonia mydas), male, mating with female. Two pursuing males biting at his fins in attempt to persuade him to relinquish his position. Sipadan Island, Malaysia, Celebes sea, Pacific...

Nick Upton / Jackdaw (Corvus monedula) pair dive bombing and harassing a Grey squirrel (Sciurus carolinensis) as it emerges from a nest box the birds want to nest in which is already occupied by the squirrel and i...

Nick Upton / Jackdaw (Corvus monedula) pair dive bombing and harassing a Grey squirrel (Sciurus carolinensis) as it emerges from a nest box the birds want to nest in which is already occupied by the squirrel and i...