A group of youths documented the changing landscape in Alaska’s Denali National Park and Preserve as they learned backcountry skills and took “repeat” photography of Sunset Glacier.

The latest video in the “Outside Science (inside parks)” series follows the group Exploring Change in Denali into the wilds of the vast park, complete with a grizzly sighting.

Every month in 2016, the “Outside Science (inside parks)” video series will showcase ways “the next generation is getting involved in park science.” This is the fifth episode released by the National Park Service and produced by students from Colorado State University. Previous videos chronicle a BioBlitz at Hawai‘i Volcanoes National Park, collecting dragonflies to study mercury levels at Great Sand Dunes National Park and Rocky Mountain National Park, and red tides at Cape Cod National Seashore, and baby turtles at Gulf Islands National Seashore.