*Update* – Sea otters

A previous post claimed that sea otters were the only marine mammals that use tools.

Turns out that dolphins sometimes put sponges on their noses to protect them when they’re digging around in the sand.

The sea otter’s grade remains unchanged at a B+, and the sponge keeps its C. However, it should be noted that this behavior is just plain embarrassing for dolphin and sponge alike.

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