Annual California Sea Otter Census—2017 Spring Census Summary

The spring 2017 mainland sea otter count began on April 30, and although the shore-based counts were completed by May 12, 2017, the aerial counts were not completed...2017年春季中国大陆海獭（sea otter）数量调查于4月30日启动，尽管岸基计数工作已于2017年5月12日完成，但航空计数工作尚未完成。