The Fort Indiantown Gap military base in Lebanon County is home to the world's only surviving population of the eastern regal fritillary, a large butterfly that the U.S. Fish and Wildlife Service ...

An orange and black species of butterfly native to the Kansas prairies is declining in population, and federal wildlife officials want to protect it. The western regal fritillary butterfly, which ...

May 29—The only place to find the regal fritillary butterfly in the East Coast is at Fort Indiantown Gap. It’s a rare treat to spot what the military training site compares to a monarch butterfly ...

At Fort Indiantown Gap in northern Lebanon County, a vast stretch of grassland houses the only population of the rare regal fritillary butterfly in the eastern United States. Several of these ...

Where the monarch is the king of butterflies, the "Queen of the Prairie" is needing help. Monarch butterflies can travel long distances, like to Mexico, but regal fritillary butterflies stick to ...

It's not easy to see the orange and black spotted regal fritillary butterfly if you live in the Eastern U.S. It used to be common across much of the country, and is still found in the Midwest. But ...

Naturalists at ZooAmerica in Hershey again this year released about 60 adult regal butterflies and about 10,000 pepper-grain-sized caterpillars in spots across Pennsylvania, where they home to ...