Otters and Their Lifelong Rock Collections

Otters have loose pouches of skin under their armpits that act like pockets, and they often store a favorite rock in there, sometimes even keeping the same rock for their entire lives.

Sea otters are one of the few non-human animals known to use tools. When it comes to cracking open hard-shelled prey like clams or mussels, their go-to gadget is a rock.

But not just any rock.

Some otters actually select a favorite and keep it tucked safely in a little underarm pouch—like nature’s version of a tool belt. These loose folds of skin aren’t just handy; they’re genius.

Otters will roll onto their backs, place a rock on their belly, and smash shellfish against it to open them. When they’re done, the rock goes right back into the pocket.

Researchers have seen otters carry the same rock for years—possibly even their entire lives.

Why the attachment? It could be that the rock is just the right shape, weight, or texture. Or maybe it’s part of a learned habit passed down from otter to otter.

And those pockets aren’t just for tools. Otters also stash snacks or other finds while diving, then bring them up to the surface to enjoy.

So next time you spot an otter floating on its back, know that it might be hiding a prized possession right under its arm.

Try This at Home:
If you had an otter pocket, what would you keep in it? Ask your kid what special item they’d carry around every day.

@a1motifs

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