Do you have a national park question in search of an answer? Ask Costa Dillon, a recently retired park superintendent.

While many long to see mountain goats in the wild, at Grand Teton National Park biologists are trying to figure out how to deal with non-native goats that pose a threat to the park's bighorn sheep.

The soft glow of luminarias will guide visitors through some of the cliff dwellings at Mesa Verde National Park on December 5 when the park holds its Holiday Open House.

Bottled-up genetics lead to problems, as evidenced by the inbreeding woes of the wolves at Isle Royale National Park. Though mountain lions that roam Santa Monica Mountains National Recreation Area aren't as inbred as those wolves, the lack of genetic diversity is a growing concern.