Leviathan was one of the most formidable predators ever to live, a giant sperm whale that specialized in hunting large marine ...

Whale watchers in Madeira captured the astonishing moment orcas took down the deep-diving marine mammal. The predatory behavior had never been documented in the region. A pygmy sperm whale was ...

Sperm whales have the largest brain of any living animal, weighing up to 9 kilograms (nearly 20 lbs), a key reason scientists believe they possess advanced communication and social intelligence. They ...

When marine biologist Shane Gero spotted a plume of blood spreading across the water where a group of sperm whales had gathered in the Caribbean, he feared the worst — injury to one of the whales, ...