last killed in 1768 at Bering Island
cold marine herbivore endemic to Commander Islands, Russia
no known specimens
disappeared after hunting for food by sailors
References:
Allen, G. M. Extinct and Vanishing Mammals of the Western Hemisphere QL715.A44 1942 p.535
Nilsson, G. The Endangered Species Handbook QL82.N55 1983 ISBN 0-938-424-09-7 p.210
Williams, J. and Nowak, R. chapter in The Last Extinction QH75.L36 1993 pp. 107-139
Ziswiler, V. Extinct and Vanishing Animals QL88.Z513 1967 p.112
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