National Park Week kicks of April 20 this year, and the National Park Service has provided a week-long list of ways to celebrate the parks.

Arguing that "wolf-hating states" will sabotage the recovery of the grey wolf in the West, four conservation groups Monday sued the U.S. Fish and Wildlife Service for declining to provide Endangered Species Act protections for the canids.

Funding from the Great American Outdoors Act is enabling the National Park Service to rehabilitate Zion National Park's South Campground.

How much do you really know about units of the National Park System? Indeed, there are so many facts and interesting tidbits. You might, however, know more than you realize. Just check out this latest National Parks Traveler quiz and trivia piece. Maybe you’ll even learn a few new things.