The persistent presence of humans and their infrastructure in U.S. national parks has yielded dramatic changes in the ...

Discover how wildlife in U.S. national parks responded to the 2020 COVID shutdowns, based on GPS tracking data.

The presence of humans and human infrastructure in U.S. national parks has lasting effects on the behaviors of the large ...

Start the day smarter. Get all the news you need in your inbox each morning. Here's why Arizona national parks are a wildlife hotspot and where to go to see the most animals.

Howler monkeys typically live in groups of between six and 15 animals. They are much larger than squirrel monkeys, ranging between 20 and 24 inches long, with a tail of a similar length.

Two Arizona national parks were named among the best parks for seeing wildlife like mountain lions, bison and birds. Here's where to go to see animals.