Resurveying California's Wildlife

In this video, students learn how scientific surveys of wildlife are performed at a site in Yosemite, California, and how these surveys are being used -- in conjunction with studies from the early 1900s -- to provide evidence that animal populations in Yosemite have shifted over time in response to rising temperatures.

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Teaching Tips

Teaching Tips

Educator can tie in Joseph Grinnell's observation that humans impact the environment.

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