A mass extinction is a short period of geological time in which a high percentage of biodiversity, or distinct species — bacteria, fungi, plants, mammals, birds, reptiles, amphibians, fish, ...

Thanks to their impressive building skills, beavers are a keystone species—an animal whose activities support its entire ...

WWF works to sustain the natural world for the benefit of people and wildlife, collaborating with partners from local to global levels in nearly 100 countries.