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]
Most animals are physically mature at around 6 m, and maximum length and weight are 6,5 m and 3430 kg. Females are slightly longer than males.