Autumn aspen trees near Guardsman Pass, Utah, United States Sept 22, 2026

What makes a tree "quake?" Take a closer look at an aspen leaf. Its flattened stalk catches even a light breeze, making the leaves flutter and giving the tree its name: quaking aspen. Near Guardsman Pass in Utah, United States, these trees form striking groves across the higher mountain slopes, where cooler, moist conditions suit them well.

© Danita Delimont/Shutterstock

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