J. J. Alava and R. Carvajal, “First records of elephant seals on the Guayaquil Gulf, Ecuador: on the ocurrence of either a <i>Mirounga leonina</i> or <i>M. angustirostris</i>”, Lat. Am. J. Aquat. Mamm., vol. 4, no. 2, pp. 195-198, Dec. 2005.