Test Your Knowledge Of Animal Intelligence With This Fact-Packed Quiz!

Where do otters keep the rocks they use to break hard shells?

Retry Correct Incorrect Otters are one of the few mammal species to use tools, and those tools usually consist of rocks that let them break into hard-shelled food sources. According to the U.S. Department of Interior, the loose patch of skin under their arm is typically used to store both these rocks and the food they’ve foraged.

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Frank Molter/picture alliance via Getty Images

Frank Molter/picture alliance via Getty Images

Where do otters keep the rocks they use to break hard shells?

• They hold it in their mouths until it’s time to use it
• A loose patch of skin under their armpit
• They don’t keep them when they’re done using them
• They tuck it between their legs