Enhydra lutris (Sea Otter), Assessors: A. Doroff and A. Burdin, Reviewers: S.A. Hussain and J. Conroy, The IUCN Red List of Threatened Species, ... The Sea Otter is considered to be Endangered due its vulnerability to large-scale population declines. The species is believed to have undergone a decline exceeding 50% over the past 30 years (approximately three generations) ...