Red-tailed hawk (Buteo jamaicensis), bird of prey, Herefordshire, England, United Kingdom, Europe

Red-tailed hawk (Buteo jamaicensis), bird of prey, England, United Kingdom, Europe

Harris hawk (Parabuteo unicinctus), raptor, Herefordshire, England, United Kingdom, Europe

Star Ferry with Hong Kong in the background, Hong Kong, China, Asia

Adult hooked-bill kite (Chondrohierax uncinatus), on the Rio Tres Irmao, Mata Grosso, Pantanal, Brazil, South America

Tawny eagle (Aquila rapax), Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Southernpale chanting goshawk (Melierax canorus), Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Grey reef shark (Carcharhinus amblyrhinchos) being hooked with long line, Rongelap, Marshall Islands, Pacific

Skipjack tuna (Katsuwonus pelamis) hooked on fishing line, Kailua-Kona, Hawaii, United States of America, North America

A Mexican fisherman holds up a Jumbo Squid (Dosidicus gigas - also called the Humbolt squid) hand caught at night off the Baja Peninsula, in Santa Rosalia, Baja, Mexico

Jumbo Squid (Dosidicus gigas) eye and head detail. Mexican panga fishery in Santa Rosalia, Baja, Mexico

Hourglass Dolphin, Lagenorhynchus cruciger, Male Dolphin breaching at great speed, Drake Passage, Southern Ocean. Males of this species can be identified by the huge hooked dorsal fin and post-anal keel.

Hourglass Dolphin, Lagenorhynchus cruciger, Male Dolphin breaching at great speed, Drake Passage, Southern Ocean. Males of this species can be identified by the huge hooked dorsal fin and post-anal keel.

Hourglass Dolphin, Lagenorhynchus cruciger, Female Dolphin porpoising, Drake Passage, Southern Ocean. Females of this species can be identified by the smaller less-hooked dorsal fin and the lack of a post-anal keel.

Hourglass Dolphin (Lagenorhynchus cruciger) rare unusual image, adult Male porpoising. Drake Passage, Southern Ocean. MORE INFO: Males of this species can be identified by the huge hooked dorsal fin and post-anal keel, both of which are visible on this animal.

Painted lady caterpillar shortly before changing to chrysalis. It hangs itself upside down in this hooked position for around 24 hours. It continues to move throughout the 24 hours in gentle changes of position. . Isle of White, UK. Isle of White, UK

Skipjack tuna (Katsuwonus pelamis) hooked on fishing line, Kailua-Kona, Hawaii, United States of America, North America

Skipjack tuna (Katsuwonus pelamis) hooked on fishing line, Kailua-Kona, Hawaii, United States of America, North America

Skipjack tuna hooked in fishing line, Katsuwonus pelamis, Kailua-Kona, Hawaii, United States of America, Pacific

Fisherman pulls skipjack tuna hooked in fishing line, Katsuwonus pelamis, Kailua-Kona, Hawaii, United States of America, Pacific

Sports, canoying

Close-up of a Piranha's teeth during a fishing trip in the Amazon.

A Rusty Hook Holding A Chain, Shildon, Durham, England