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Southern stingray (Hypanus americanus) over sand in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Southern stingray (Hypanus americanus) over sand in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Southern stingray (Hypanus americanus) over sand in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Young whale shark (Rhincodon typus), filter feeding near snorkeler at El Mogote, Baja California Sur, Mexico, North America

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), massing in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), massing in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse shark (Ginglymostoma cirratum), on the sand in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse shark (Ginglymostoma cirratum), on the sand in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Southern stingray (Hypanus americanus) with snorkeler in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Whale shark (Rhincodon typus), underwater with snorkeler on Ningaloo Reef, Western Australia, Australia, Pacific

Whale shark (Rhincodon typus), underwater with snorkeler on Ningaloo Reef, Western Australia, Australia, Pacific

A wild American alligator (Alligator mississippiensis), in Shark Valley, Everglades National Park, Florida, United States of America, North America

Whale shark (Rhincodon typus) underwater with snorkelers off El Mogote, near La Paz, Baja California Sur, Mexico, North America

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Surfer in Hanalei Bay, with a shark painted on his back, Kauai, Hawaii, United States of America, North America

Whale shark (Rhincodon typus), underwater with snorkelers on Ningaloo Reef, Western Australia, Australia, Pacific

An adult great blue heron (Ardea herodias), spears a fish in Shark Valley, Everglades National Park, Florida, United States of America, North America

Whale shark (Rhincodon typus), underwater with snorkeler on Ningaloo Reef, Western Australia, Australia, Pacific

Adult California gray whale (Eschrictius robustus), spy-hopping in San Ignacio Lagoon, Baja California, Mexico, North America

Young whale shark (Rhincodon typus), filter feeding near the surface at El Mogote, Baja California Sur, Mexico, North America

Whale shark (Rhincodon typus), underwater with snorkelers off El Mogote, near La Paz, Baja California Sur, Mexico, North America

An adult Galapagos bullhead shark (Heterodontus quoyi), Buccaneer Cove, Santiago Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

A wild American alligator (Alligator mississippiensis), in Shark Valley, Everglades National Park, Florida, United States of America, North America

Great blue heron (Ardea herodias), standing alert beside trail in Shark Valley, Everglades National Park, Florida, United States of America, North America

A young whale shark (Rhincodon typus), near kayaker in Bahia Coyote, Conception Bay, Baja California Sur, Mexico, North America

A young whale shark (Rhincodon typus), near kayaker in Bahia Coyote, Conception Bay, Baja California Sur, Mexico, North America

Whale shark (Rhincodon typus), filter feeding underwater off El Mogote, near La Paz, Baja California Sur, Mexico, North America

Whitetip reef shark (Triaenodon obesus) underwater at Sombrero Chino, Galapagos, Ecuador, South America

A wild American alligator (Alligator mississippiensis), at night in Shark Valley, Everglades National Park, Florida, United States of America, North America

Young whale shark (Rhincodon typus), filter feeding near snorkeler at El Mogote, Baja California Sur, Mexico, North America

Young whale shark (Rhincodon typus), filter feeding near the surface at El Mogote, Baja California Sur, Mexico, North America

Adult whale shark (Rhincodon typus), underwater on Ningaloo Reef, Western Australia, Australia, Pacific

Adult whitetip reef shark (Triaenodon obesus) swimming in Puerto Egas, Santiago Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

American alligator (Alligator mississippiensis), swimming beside trail in Shark Valley, Everglades National Park, Florida, United States of America, North America

Juvenile whale shark (Rhincodon typus), underwater near Los Islotes, Baja California Sur, Mexico, North America

Adult anhinga (Anhinga anhinga) at sunset in Shark Valley, Everglades National Park, Florida, United States of America, North America

Adult whale shark (Rhincodon typus), underwater on Ningaloo Reef, Western Australia, Australia, Pacific

Adult whitetip reef shark (Triaenodon obesus) under a ledge in Puerto Egas, Santiago Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

An adult Galapagos bullhead shark (Heterodontus quoyi), Buccaneer Cove, Santiago Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Whale shark (Rhincodon typus), underwater with snorkelers off El Mogote, near La Paz, Baja California Sur, Mexico, North America

Adult anhinga (Anhinga anhinga), in Shark Valley, Everglades National Park, Florida, United States of America, North America

Young whale shark (Rhincodon typus), being biopsied by researcher at El Mogote, Baja California Sur, Mexico, North America

Adult whale shark (Rhincodon typus), underwater on Ningaloo Reef, Western Australia, Australia, Pacific

Whale shark (Rhincodon typus) underwater with snorkelers off El Mogote, near La Paz, Baja California Sur, Mexico, North America

Adult snowy egret (Egretta thula), Shark Valley, Everglades National Park, Florida, United States of America, North America

Whale shark (Rhincodon typus), underwater with snorkelers off El Mogote, near La Paz, Baja California Sur, Mexico, North America

Adult whitetip reef shark (Triaenodon obesus) under a ledge in Puerto Egas, Santiago Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult anhinga (Anhinga anhinga) at sunset in Shark Valley, Everglades National Park, Florida, United States of America, North America

Adult anhinga (Anhinga anhinga) at sunset in Shark Valley, Everglades National Park, Florida, United States of America, North America

A wild American alligator (Alligator mississippiensis), at night in Shark Valley, Everglades National Park, Florida, United States of America, North America

Black tipped reef sharks in the Blue Lagoon, Rangiroa atoll, Tuamotus, French Polynesia, South Pacific, Pacific

Aerial of the Hamelin Pool stromatolites, Shark Bay, UNESCO World Heritage Site, Western Australia, Australia, Pacific

Aerial of Little Lagoon, Denham, Shark Bay, UNESCO World Heritage Site, Western Australia, Australia, Pacific

Aerial of the Hamelin Pool stromatolites, Shark Bay, UNESCO World Heritage Site, Western Australia, Australia, Pacific

Black tipped reef sharks in the Blue Lagoon, Rangiroa atoll, Tuamotus, French Polynesia, South Pacific, Pacific

Aerial of the Hamelin Pool stromatolites, Shark Bay, UNESCO World Heritage Site, Western Australia, Australia, Pacific

Aerial of the Hamelin Pool stromatolites, Shark Bay, UNESCO World Heritage Site, Western Australia, Australia, Pacific

Aerial of the Hamelin Pool stromatolites, Shark Bay, UNESCO World Heritage Site, Western Australia, Australia, Pacific

Aerial of the Hamelin Pool stromatolites, Shark Bay, UNESCO World Heritage Site, Western Australia, Australia, Pacific

Aerial of Little Lagoon, Denham, Shark Bay, UNESCO World Heritage Site, Western Australia, Australia, Pacific

Close-up of a basket of shark fins for export to eastern markets, the flesh is eaten locally, in the port of Hodeida, Yemen, Middle East

Snorkeller and whale shark (Rhincodon typus) feeding at the surface on zooplankton, mouth open, known as ram feeding, Yum Balam Marine Reserve, Quintana Roo, Mexico, North America

Great white shark swims by cage, great white shark cage diving, Marine Dynamics, Dyer Island, South Africa, Africa

Shark scientist monitors live satellite tagged great white shark (Carcharodon carcharias) on computer, Western Cape, South Africa, Africa

Scientists use hydrophone to track tagged great white shark (Carcharodon carcharias) behaviour, Gaansbai, Western Cape, South Africa, Africa

The Headington Shark, a rooftop sculpture located on New High Street by John Buckley, Headington, Oxford, Oxfordshire, England, United Kingdom, Europe

Dorsal fins at the surface, telltale signs of the giant basking shark (Cetorhinus maximus), Coll, Inner Hebrides, Scotland, United Kingdom, Europe

Acrylic glass tunnel where sharks swim above visitors, Sydney Aquarium, Sydney, New South Wales, Australia, Pacific

Close encounters with Nurse shark on G Spot Reef, Turks and Caicos, West Indies, Caribbean, Central America

Great white shark swims by cage, great white shark cage diving, Marine Dynamics, Dyer Island, South Africa, Africa

Scientist uses hydrophone to track tagged great white shark (Carcharodon carcharias) behaviour in real time, Gaansbaai, Western Cape, South Africa, Africa