The decline of quokkas in Australia has been somewhat of a mystery, but resarcehers have a suspect. Invasive species, and foxes in particular.

Images from camera traps show West African lions venturing out of protected areas and closer to humans. Researchers have an idea why.

In a kind of "fatal attraction," small predators drawn to kill sites for leftover scraps may get killed themselves when big predators return for seconds.

Is your outdoor cat a wildlife-killer? "We found that house cats have a two- to 10-time larger impact on wildlife than wild predators—a striking effect."

Competition between species and predation aren't the drivers behind adaptation that scientists might've thought, new research indicates.

After frogs in protected area of Panama died off en masse, the snakes that ate them began to disappear, too. It shows the extent of our "biodiversity crisis."

Birds in flocks with many different species change the way they hunt to better work as a team. It's a little like boy bands, one researcher says.

Sea urchins boomed after a mysterious disease decimated sea stars off the California coast. Researchers say it shows how redundancy can protect ecosystems.

New research digs into the back and forth between predators and prey, confirming that these cycles can last for long periods of time.