Wolf, J. B. W., Kauermann, G., & Trillmich, F. (2005). Males in the shade: Habitat use and sexual segregation in the Galápagos sea lion (Zalophus californianus wollebaeki). Behavioral Ecology and Sociobiology, 59(2), 293-302. doi:10.1007/s00265-005-0042-7.