摘要：Floating is effortless for a California sea otter. The problem is keeping the population afloat.California sea otter numbers continue a decline that began in 2016, according to the latest U.S. Geological Survey count.The three-year average population tally remains above 3,090—following an unusually high population count in 2015—which should trigger consideration for removing federal protections. But so far, the U.S. Fish and Wildlife Service (FWS) is remaining cautious because the marine mammals appear to be having difficulties expanding their range.
