Wildlife

A giant mosasaur species called Thalassotitan atrox had teeth like a killer whale and ruled the oceans around Morocco towards the end of the Cretaceous period.

Long-tailed macaques in Indonesia use stones to masturbate, according to a new study that furthers researchers' understanding of the monkey "sex toy" hypothesis.

Almost all sea turtle hatchlings are emerging from their eggs as females on some Florida beaches. What's going on?

Scientists have identified a woodlouse relative — a 10-inch-long, creamy yellow critter called Bathynomus yucatanensis from deep in the Gulf of Mexico.

The longest-living animals can survive for centuries and millennia, even pausing the aging process altogether. Here are the longest-living animals in the world.

In a behind-the-scenes look at 'Prehistoric Planet,' see how the creators went to extraordinary lengths to make the dinosaur series feel like an authentic nature documentary.

Asian elephants, like their African cousins, seem to mourn their dead, sometimes carrying their lost infants for days or weeks.

A rolling robot is helping scientists to observe and record penguin behavior.

The Cambodian Ministry of Environment has asked people to stop collecting a carnivorous plant that resembles a penis, after footage appeared on social media of people picking the rare plant.

A "mystery monkey" in Borneo appears to be a rare hybrid between two different species competing for habitat, a new study suggests.

Residents of Kommetjie, South Africa were treated to a rare sight this weekend: a giant squid measuring 11.5 feet (3.5 meters) long.

Dingoes are an "intermediary" between wolves and domestic dog breeds, according to a new study that sequenced the genome of a dingo puppy.

Spanish police have seized 1,090 taxidermy animals from a warehouse in eastern Spain. Around a third of the specimens belong to species that are endangered or are already extinct.

A rare Greenland shark that washed up on a U.K. beach is thought to be at least 100 years old, but scientists aren't sure what happened to it.

Alien hammerhead flatworm named after pandemic is one of two newly described species found in countries outside their native range.

A mountain lion tweet by the Oklahoma Department of Wildlife Conservation led to a viral debate about pet ownership.

Some "highly predatory" brown bears change habitats to target more reindeer and moose calves after emerging from hibernation in Sweden, a new study finds.

Jonathan the tortoise has become the oldest tortoise ever by reaching 190 years old. He was already the oldest living land animal.