The marine mammals are doing millions of dollars’ worth of conservation work by rebuilding saltmarshes in Elkhorn Slough estuary. Since the mid-1980s, conservation work has seen otters rebound. And by taking a big bite out of the marsh crab infestation they’ve reduced erosion by up to 90% in the past decade, a new study found.
Sea otters are saving California's coast from erosion. Here's how
