Beavers are making a comeback. Nearly driven to extinction by the fur trade, nature’s best architects are now 6–12 million strong in the United States. This return will provide significant benefits to our country’s ecology, which has lost much of its wetlands to development and agriculture. Learn...

Once robust, populations of cougars (also known as mountain lions or pumas) have declined drastically across most of their range in the Americas. The population decline is due to the impact of extensive hunting and predator control, in addition to continued habitat loss and fragmentation. Cougars...