Despite more than two decades to get the task accomplished, and almost two years after a federal judge ordered the Federal Aviation Administration and National Park Service to get the job done by this summer, air tour management plans for eight national parks will not be completed on schedule, according to court documents filed by the two agencies.

Tegu lizards, a large invasive reptile that has turned up in Everglades National Park in Florida, can adapt to temperatures cooler than the species tolerated in its native Argentina, according to U.S. Geological Survey studies.

Grizzly bears are starting to stir in Yellowstone National Park, where one of the bruins was spotted in a meadow in the west-central part of the park.

Fetching as she is, the reconstructed French fortress is not the draw on this blustery day as a fierce winter storm approaches Cape Breton. It’s a 40-minute interpretive walk that quietly beckons because it speaks to how coastal erosion is impacting the Fortress of Louisbourg National Historic Site, its rocky shoreline and one of its centuries-old mass grave.