Winter fun – a puzzle

By mid-December, my husband Bill and I plan a cross-country skiing vacation around New Year's Day. We live in California, so we often ski in the Sierra Nevada.
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Here we are east of Yosemite National Park:
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We look for animal tracks such as these:

The wooden stick is one inch long.

Can you guess whose tracks they are?

Click here for a clue and for the answer.