Dear Colleagues, The Mexican Society for Marine Mammalogy (SOMEMMA) is pleased to announce its *fourth biennial Marine Mammalogy Summer School, the IV-E3M,* which will take place in La Paz, Mexico, July 14-21, 2019. The IV-E3M offers theoretical and practical knowledge on the biology, ecology, evolution, natural history, physiology and conservation of marine mammals. The IV-E3M is structured in two modules; a *50-h course aimed at undergraduate students with limited or no experience with marine mammals*, that will encompass the biology, ecology, evolution, natural history, physiology and conservation of marine mammals and includes a hands-on field trip to Espiritu Santo National Park aboard a research vessel, and a *20-h advanced module, aimed at postgraduate students or final year undergraduates*, who can select one of six topics: 1) Ecotoxicology and Marine Pollution (course delivered in spanish and english) 2) Stable Isotopes in Ecological and Environmental Studies (course delivered in english) 3) Telemetry as a tool for animal ecology (course delivered in english) 4) Conservation genetics (course delivered in english) 5) Passive acoustic monitoring and photoID database management (course delivered in english) 6) Introduction to marine mammal rehabilitation and disease (course delivered in english) 7) Behavioural ecology of marine mammals (course delivered in spanish) Our instructors are well recognized marine mammalogists from Mexico, Brasil, Canada and the US ( https://www.escuelamexicanademamiferosmarinos.com/copia-de-instructores-2-1 ). Our first two summer schools were targeted exclusively to Mexican students. In 2017, the third summer school broadened its scope and was open to international participants. We had participants from five countries, and the experience was very gratifying for participants and instructors. This year we are once more opening our summer school to international participants. We have strived to maintain costs extremely low: the basic module costs *120 US dollars* (early fee) and the advanced module costs *140 US dollars* (early fee). This fee *includes accommodation*, the course diploma, complementary material, and reading material). More details on the program, instructors and registration costs can be found at: http://www.escuelamexicanademamiferosmarinos.com https://www.facebook.com/4Escu <https://www.facebook.com/4EscuelaMexicanaMastozoologiaMarina/> elaMexicanaMastozoologiaMarina <https://www.facebook.com/4EscuelaMexicanaMastozoologiaMarina/>/ <https://www.facebook.com/4EscuelaMexicanaMastozoologiaMarina/> Hope to see you in La Paz! Karina Acevedo-Whitehouse & Fabiola Guerrero de la Rosa IV-E3M organizers escuelamexicanamm@gmail.com -- ----------------------- Think of all the men who never knew the answers. Think of all those who never even cared. Still, there are some who ask why, who want to know, who dare to try. Rod Mckuen (Here he comes again)