Philippe Clement / Stranded Sperm whale (Physeter macrocephalus) on beach at Knokke, Belgium, February 2012. No release available.

Doug Perrine / Sperm whale (Physeter macrocephalus) juvenile female aged about 6-11 years, Endangered Species, Commonwealth of Dominica, Caribbean, March

Doug Perrine / Sperm whale (Physeter macrocephalus) juvenile female aged about 6-11 years, Endangered Species, Commonwealth of Dominica, Caribbean, March

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) calf swimming near water surface, Ogasawara Island, Japan

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) surfacing, Azores Islands, Portugal

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) white morph near surface, Azores Islands, Portugal

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) portrait, white morph, Azores Islands, Portugal

Flip Nicklin / Sperm Whale (Physeter macrocephalus) pod, Dominica

Flip Nicklin / Sperm Whale (Physeter macrocephalus) social group at water surface

Flip Nicklin / Sperm Whale (Physeter macrocephalus) underwater portrait

Flip Nicklin / Sperm Whale (Physeter macrocephalus) tail, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) tail, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) tail, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) surfacing, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) adult with attached Remoras skimming ocean surface, Dominica

Flip Nicklin / Sperm Whale (Physeter macrocephalus) mother and albino baby swimming, Portugal

Flip Nicklin / Sperm Whale (Physeter macrocephalus) tail at sunset, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) tail at sunset, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) tail, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) group socializing underwater, Dominica

Flip Nicklin / Sperm Whale (Physeter macrocephalus) tail, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) tail

Flip Nicklin / Sperm Whale (Physeter macrocephalus) tail, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus), Sri Lanka

Flip Nicklin / Sperm Whale (Physeter macrocephalus), Sri Lanka

Flip Nicklin / Sperm Whale (Physeter macrocephalus) entangled in net, Sri Lanka

Flip Nicklin / Sperm Whale (Physeter macrocephalus) mother and white morph calf, Portugal

Philippe Clement / Stranded Sperm whale (Physeter macrocephalus) on beach at Knokke, Belgium, February 2012

Norbert Wu / Sperm Whale (Physeter macrocephalus), Caribbean Sea, Dominica

Norbert Wu / Sperm Whale (Physeter macrocephalus), Caribbean Sea, Dominica

Norbert Wu / Sperm Whale (Physeter macrocephalus) with diver, Caribbean Sea, Dominica

Norbert Wu / Sunlight shining through water, Caribbean Sea, Dominica

Norbert Wu / Sperm Whale (Physeter macrocephalus) trio floating vertically, Caribbean Sea, Dominica

Norbert Wu / Sperm Whale (Physeter macrocephalus) trio floating vertically, Caribbean Sea, Dominica

Norbert Wu / Sperm Whale (Physeter macrocephalus) trio, Caribbean Sea, Dominica

Norbert Wu / Sperm Whale (Physeter macrocephalus) trio, Caribbean Sea, Dominica

Norbert Wu / Sperm Whale (Physeter macrocephalus) pair, Caribbean Sea, Dominica

Norbert Wu / Sperm Whale (Physeter macrocephalus) pair with diver, Caribbean Sea, Dominica

Norbert Wu / Sperm Whale (Physeter macrocephalus) group of seven with diver filming them, Caribbean Sea, Dominica

Norbert Wu / Sperm Whale (Physeter macrocephalus) head showing eye, Caribbean Sea, Dominica

Norbert Wu / Sperm Whale (Physeter macrocephalus), Caribbean Sea, Dominica

Norbert Wu / Sperm Whale (Physeter macrocephalus) with diver, Caribbean Sea, Dominica

Doug Perrine / Sperm whale (Physeter macrocephalus) juvenile female aged about 6-11 years, with remora fish, Endangered Species, Commonwealth of Dominica, Caribbean, March

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) calf swimming near water surface, Ogasawara Island, Japan

Suzi Eszterhas / Sperm Whale (Physeter macrocephalus) diving, Sea of Cortez, Baja California, Mexico

Flip Nicklin / Sperm Whale (Physeter macrocephalus) pod surfacing, Galapagos Islands, Ecuador

Flip Nicklin / Sperm Whale (Physeter macrocephalus) diving, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) diving, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) diving, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) at ocean's surface, Dominica

Flip Nicklin / Sperm Whale (Physeter macrocephalus) diving, Indian Ocean

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) surfacing, Ogasawara Island, Japan

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) pair at surface, Ogasawara Island, Japan

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) surfacing, Ogasawara Island, Japan

Flip Nicklin / Sperm Whale (Physeter macrocephalus) researchers Steve Dawson and Elizabeth Slooten using hydrophones to listen to whale vocalizations, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) researchers aboard IFAW boat Song of the Whale, Dominica

Flip Nicklin / Sperm Whale (Physeter macrocephalus) adult underwater, Dominica

Flip Nicklin / Sperm Whale (Physeter macrocephalus) males swim with females and young, Dominica

Flip Nicklin / Sperm Whale (Physeter macrocephalus) curious calf, Dominica

Flip Nicklin / Sperm Whale (Physeter macrocephalus) social group underwater, Dominica

Flip Nicklin / Sperm Whale (Physeter macrocephalus) tail, New Zealand

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) pair swimming together, Ogasawara Island, Japan

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) near surface, Ogasawara Island, Japan

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) underside, Ogasawara Island, Japan

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) underside, Ogasawara Island, Japan

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) opening mouth near surface, Ogasawara Island, Japan

Colin Monteath / Sperm Whale (Physeter macrocephalus) teeth with Scrimshaw artwork sitting atop whale vertebrae, dates from 1840's whaling era, Fyffe Historic House, Kaikoura, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) researchers aboard the Balaena watch surfacing whales, Galapagos Islands, Ecuador

Tui De Roy / Sperm Whale (Physeter macrocephalus) adult female in breeding grounds, Galapagos Islands, Ecuador

Tui De Roy / Sperm Whale (Physeter macrocephalus) pod of females in deep offshore waters, Galapagos Islands, Ecuador

Flip Nicklin / Sperm Whale (Physeter macrocephalus) adult diving, Dominica

Patricio Robles Gil / Sperm Whale (Physeter macrocephalus) aerial view of two swimming near the surface in the Gulf of California, Mexico

Patricio Robles Gil / Sperm Whale (Physeter macrocephalus) aerial view of two swimming near the surface in the Gulf of California, Mexico

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) white morph portrait, underwater, Azores Islands, Portugal

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) pod with calf at the surface, Azores Islands, Portugal

Barbara Todd / Sperm Whale (Physeter macrocephalus) aerial view of pod, Kaikoura, New Zealand

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) pod underwater, Azores Islands, Portugal

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) white morph near surface, Azores Islands, Portugal

Hiroya Minakuchi / Sperm Whale (Physeter macrocephalus) white morph portrait, Azores Islands, Portugal

Flip Nicklin / Sperm Whale (Physeter macrocephalus) pod, Dominica, Caribbean

Flip Nicklin / Sperm Whale (Physeter macrocephalus) underwater with nose touching surface

Flip Nicklin / Sperm Whale (Physeter macrocephalus) pod at surface

Flip Nicklin / Sperm Whale (Physeter macrocephalus) researcher Jonathan Gordon on board, recording songs of the whale using a hydrophone to listen for whales, Dominica

Flip Nicklin / Sperm Whale (Physeter macrocephalus) tail at dusk, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) fluke

Flip Nicklin / Sperm Whale (Physeter macrocephalus) with film maker Rick Rosenthal, Dominica

Flip Nicklin / Sperm Whale (Physeter macrocephalus) tail, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) tail, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) tail, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) fluke and tourists watching from boat, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) showing teeth, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) researcher listening for vocalizations, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) watching, New Zealand

Flip Nicklin / Sperm Whale (Physeter macrocephalus) group surfacing, one with open mouth showing teeth, Azores

Flip Nicklin / Sperm Whale (Physeter macrocephalus) group at water surface, Galapagos Islands, Ecuador

Flip Nicklin / Sperm Whale (Physeter macrocephalus) researcher photographing whale pod