A keystone in an arch's crown secures the other stones in place. Keystone species play the same role in many ecological communities by maintaining the structure and integrity of the community. The ...

What do bison, beaver, wolves and sea otters all have in common? They're keystone species. That means they have an outsized impact on their ecosystem. It took humans driving some of these to near ...

Across the globe, wildlife is in crisis. Insect populations are crashing, bird species are disappearing, and pollinators, the unsung heroes of food production, are vanishing at alarming rates. One of ...

A critical species to the ecosystem is facing a variety of threats. This Earth Day, ABC News is taking a look at solutions for issues related to climate change and the environment with the series, ...