Second announcement of the 25th ECS Conference This is the *Second Announcement of the 25th Conference of the European Cetacean Society!* CIRCE, Conservation, Information and Research on Cetaceans and the "Estación Biológica de Doñana" of the CSIC (Consejo Superior de Investigaciones Científicas) is proud to announce the 25th Conference of the European Cetacean Society (ECS), whose theme will be: *"Long-term datasets on marine mammals: learning from the past to manage the future"*. The conference will also host the *annual meeting of the Spanish Cetacean Society*. The conference will have as preliminary programme: Ø Workshops: 19-20 March 2011. Ø 25th ECS Conference 21-23 March 2011. Ø Annual Meeting of the Spanish Cetacean society: 21 March 2011. Ø Video Night: 22 March 2011. Ø Excursion to the Strait of Gibraltar: 24 March 2011. Submission of abstract is available on www.europeancetaceansociety.eu (please register to have access to the abstract submission form), and general information is already available on www.circe.info. Please note the following milestones: Ø Abstract submission and workshop proposal: 19 November 2010. Ø Answer to the Authors: 24 December 2010. Ø Early Registration 14th January 2011. Ø Late registration 18 February 2011. If you have any questions, please contact ecs2011cadiz@gmail.com We are looking forward to welcoming you in Cádiz in March 2011! Renaud de Stephanis on Behalf of the Organising Committee.