California sea otter numbers are up, according to the latest population survey conducted by researchers, including those from the Aquarium. The reasons: more pups — and the addition of San Nicolas Island otters to the count. Since the 1980s, scientists have calculated populations for the southern sea otter, a threatened species in California. For 2013, USGS lists the population as 2,941. To be considered for removal from threatened status, it would need to exceed 3,090 for three consecutive years.There’s more to be done!