Perrin, W.F.; Würsig, B.; Thewissen, J.G.M. (2009). Encyclopedia of marine mammals. Second edition. Academic Press: London. ISBN 978-0-12-373553-9. xxix, 1316 pp. (look up in IMIS) [details]
Weights are known for only five specimens. Females of 163,5 and 183 cm weighed 73,5 and 88 kg, respectively. A 174 cm male weighed 94 kg, one of 180 cm 93 kg, and one of 178,5 cm about 100 kg (it had been attacked by birds).