A sperm whale sleeps, positioned vertically, as it is approached by a freediver in the Indian Ocean near Mauritius, on November 16, 2011. #

A beluga whale swims among others near Somerset Island, in the Canadian Arctic Archipelago, in Canada's Nunavut territory. #

An orca swims near a herring bait ball. #

Two humpback whale calves migrating north to warmer waters breach together along the Wild Coast of South Africa. #

A diver swims near a huge blue whale in the Indian Ocean near Sri Lanka on April 20, 2014. #

A young sperm whale nurses while swimming alongside its mother in the open water near Mauritius on November 20, 2011. #

An orca swims near Haida Gwaii (formerly the Queen Charlotte Islands), in British Columbia, Canada. #

An aerial view of humpback whales feeding in Southeast Alaska's Frederick Sound, after bubble-netting herring into a tight column. #

Blue whales feed, surrounded by seabirds. #

An orca swims through Antarctica's Lemaire Channel. #

A curious beluga swims toward the photographer in the Canadian Arctic. #

An orca stalks newborn sea lions on a Patagonian beach. #

A Bryde's whale swims near the surface of the Indian Ocean near Sri Lanka. #

A humpback whale spy-hops off Rockaway Peninsula, with the Empire State Building in the background, in the Queens borough of New York City, on September 23, 2013. #

A humpback whale splashes back to the water after leaping, as seen from above the blue water off the Gold Coast near Queensland, Australia. #

A southern right whale calf interacts with a sea lion off Argentina's Valdes Peninsula. #

An orca breaches in view of Mount Baker, some 60 miles distant, in the Salish Sea near the San Juan Islands in Washington State on July 31, 2015. #

A curious young gray whale surfaces in waters off Baja California, Mexico, in March 2017. #

A female humpback whale with two calves swims below a diver off the Baja coast of Mexico. #

A humpback whale raises its tail as it dives into the Gerlache Strait in Antarctica on February 28, 2019. #

A southern right whale breaches among waves near Hermanus, South Africa, in August 2016. #

A group of sperm whales sleeps, suspended vertically in mid-ocean. This gathering was photographed in the Indian Ocean, near Mauritius, on November 16, 2011. #

A humpback whale calf, swimming in the Indian Ocean. #

A humpback whale slaps its tail at sunset in northern Norway, in a fjord just outside the town of Andenes. #