A global decline of large carnivores has motivated scientists to understand the animals’ ecological roles, and consider whether reintroducing them can help restore ecosystems.

As some conservationists and researchers begin to return large carnivores to areas where they once roamed, scientists intensify efforts to study the ecological roles of predators.

The release of gray wolves in Yellowstone decades ago still stands as one of the few examples of a predator reintroduction, and the lessons learned continue to be debated. New projects aim to do it again.

The University of Washington parasite ecologist aims to understand how humans have changed the diversity and abundance of the enigmatic and misunderstood organisms.

Conservation biologist John Ewen discusses the recent reintroduction of Tasmanian devils to mainland Australia after a 3,000-year absence and issues that need to be considered when bringing long-departed animals back into an area.

Mace led the work to determine the criteria for the IUCN’s Red List.

As shelter-in-place orders quieted the city of San Francisco, its sparrow population developed softer, sexier songs.

Data on vertebrate species that have become, or are likely to become, extinct reveal plant eaters are most under threat.

A wildlife camera trap survey of critically endangered West African lions finds they have no preference for parks over trophy-hunting areas, possibly because of poor habitat quality in the no-hunting zones.