Dear all, We are looking forward to seeing you at the third workshop on Stable Isotopes in marine mammals: "Application of stable isotopes in studies of marine mammal ecology, biogeography, and physiology. An introduction and update on developing methodologies <https://www.wmmconference.org/workshops/#Application%20of%20stable%20isotopes%20in%20studies%20of%20marine%20mammal%20ecology,%20biogeography,%20and%20physiology.%20An%20introduction%20and%20update%20on%20developing%20methodologies> ". We would like to invite those interested in presenting their work during the workshop to contact us (lahuckst@gmail.com) and your preferences (poster or oral). We are particularly interested in people's experiences (positive and negative), troubleshooting and any advice or suggestion you might have for both bulk-tissue and Compound-Specific Stable Isotope Analysis. We will be contacting colleagues with different levels of expertise to have a better idea of what are the challenges that we, as a community, face when it comes to using stable isotopes to study the biology of marine mammals. Thanks for your feedback and hope to see you in Barcelone! Best, Cory, Seth, and Luis