(AP) - Scientists are putting tracking devices on a new species - people - as they try to learn more about how their movements affect ecosystems in national parks.
A recent study at Yosemite National Park in California tracked where people stroll through two popular meadows and pause now and then to admire the view.
Park visitors carrying global positioning devices have provided Rocky Mountain National Park in Colorado data to improve shuttle service to a popular, and often congested, lake.
Now, people-tracking by researchers with Penn State and Utah State is helping Grand Teton National Park make decisions about a popular southern approach to the park, including whether they should add parking areas, restrooms and a multipurpose trail along the way.
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