The New York Times reports
There are many reasons bears shimmy and scratch against trees. Sometimes they communicate by scent-marking trees, other times they’re removing hair and scratching that hard-to-reach itch. A new study posits an additional perk: slathering on nature-made tick repellent.
Read more at Why Do Bears Rub Against Trees? Scientists Offer New Explanation. – The New York Times
Natural History Wanderings 
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