Dear MARMAM community, On behalf of my coauthors, I am pleased to announce the recent publication of our note in Marine Mammal Science: Adame, K., M.A. Pardo, C. Salvadeo, E. Beier, F. Elorriaga-Verplancken (2017) Detectability and categorization of California sea lions using an unmanned aerial vehicle. Marine Mammal Science. DOI: 10.1111/mms.12403. The study provides functions for correcting the abundance estimations of California sea lions made from boat-based counts, by comparing them with those made from photographs taken by a drone. It also highlights the categorization bias of the traditional counting method in the Gulf of California. You can get the PDF reprint of the note directly from the journal's site at: http://dx.doi.org/10.1111/mms.12403, or upon personal request to the authors at: https://www.researchgate.net/publication/313903846_Detectability_and_categor... Kind regards, Mario A. Pardo CICESE - Unidad La Paz CONACYT Research Fellow Miraflores 334, La Paz, BCS 23050, Mexico Phone: +52(612)1213031 Ext. 28116