Some otters rely on tools to bust open hard-shelled prey items like snails, and a new study suggests this tool use is helping them to survive as their favorite, easier-to-eat foods disappear.

Otters like their tools. Researchers have observed sea otters using their chosen rocks in two ways: either as an anvil, placing the rock on their chest and smashing shellfish against it, or as a ...

Sea otters are known for using tools, but not all of them do. A new study finds those that use tools have better survival odds in a world where their traditional food sources are changing.