Article: Ocean keepers: California's sea otters are mysteriously dying in record numbers. How could their decline affect other ocean life?(LIFE: ECOSYSTEMS)(Cover Story)

Seated in a small boat, biologist James Estes scans the water in Monterey Bay, off the coast of California. He spots his target: a sea otter frolicking in the middle of a large patch of kelp, a type of seaweed. The otter disappears underwater, then resurfaces and bobs--belly up--in the rolling waves.

The otter reaches its paw into the loose pocketlike skin under its arm, and pulls out a clam and a small rock it had retrieved on its dive. It lays the rock on its chest, then--CRACK!--it skillfully slams the clamshell onto the rock. Estes watches intently as the otter whacks open its meal and starts snacking on the flesh inside the shell.

Why is Estes ...

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