Mountain lions are chased by hounds to push them above a tree, after which a ketamine dart is injected into them.

State fish and game officials declared mountain lions in the Central Coast and Southern California threatened under the state ...

Faced with the quandary of how to get mountain lions out of trees for scientific analysis, researchers dosed them with ketamine, then climbed up to ...

High above the tree line, where steep cliffs meet a clear blue sky, a unique bird circles patiently with a specific purpose.

Biologists attached tiny recording devices that looked like mini backpacks to bats. What they found revealed a surprising ...

KILLER whales have broken into an all out cannibalistic civil war, scientists believe. Biologists have warned of an all-out ...

Kittens from a local mountain lion population tracked by the National Park Service and UCLA in 2015. (Photo courtesy of the National Park Service) This story was originally published by CalMatters.

In 2022, a Russian whale researcher made a remarkable discovery on Bering Island off Russia's Pacific coast: a severed killer ...

Scientists have discovered Spinosaurus mirabilis, a 40-foot semiaquatic predator with a blade-like crest, in Niger’s Sahara, ...

Nearly 25 years after its arrival off N.C., the lionfish is now well established as an apex predator. Its ecological damage ...

Q. You wrote that blue whales are the largest mammals. What are the largest and smallest animals of other groups? What ecological problems do animals confront by being extremely big ...

Captured off the coast of San Diego, the astonishing video pictured above captures the moment that a dolphin is punched on the chin by a killer whale. The dolphin rises above the surface, but the orca ...