A wall of green leaves shifting in the slight breeze at Ephesus, behind some cacti. The videographer can be heard speaking, and the leaves can be hear...

Yosemite National Park: Throughout the Sierra Nevada, high flat plateaus are found at elevations around twelve and thirteen thousand feet. These isola...

Yosemite National Park: From foothill elevations to high mountain peaks, hundreds of flower species are found throughout Yosemite National Park. Range...

Valley Forge NH Park: Discover the history of meadows at Valley Forge by listening to this audio file.

Valley Forge NH Park: The different ways pollination occurs and the difference in plant and tree pollination is discussed. Butterflies and milkweeds a...

Valley Forge NH Park: Pine forest, nonnative plants, and invasive species at Valley Forge are discussed.

Hawai'i Volcanoes NP: What is a silversword, why is it so rare, and what is its relation to Hawaiian cowboys? Watch the video to find out.

Natural Laboratory: Non-native death cap mushrooms have been introduced at Point Reyes National Seashore and are affecting the ecosystem. Tune in to l...

Canyonlands National Park: One of the most common trees in the American southwest, the Utah Juniper is well suited to life in the desert. Join ranger ...

Redwood NP: Park Ranger Liam describes the differences between the upper and lower needles on a coast redwood.