Keystone species are those that exist in an ecosystem to keep it functioning at its healthiest levels possible. These animals may be predators or herbivores. They may be large or small. The ...

Melissa Breyer was Treehugger’s senior editorial director before moving to Martha Stewart. Her writing and photography have been featured in The New York Times, The Guardian, National Geographic, ...

Australian freshwater turtles support healthy wetlands and rivers. Yet one in three turtle species is threatened with extinction. And there is still much we don’t know about them. In today’s special ...