Sea otters are terminally cute critters and a delight to view rolling and diving in the kelp canopy of Monterey Bay, where some 3,000 endangered southern otters play an essential role in maintaining the marine kelp forest. But to crabs, clams, abalone, urchins and some fishermen, sea otters are voracious marine weasels that can eat 25% of their body weight a day — a perceived threat to life and livelihood.