Dear all, My name is Gabriel Melo-Santos and I am a PhD student from Universidade Federal do Pará, Brazil. The focus of my thesis is the acoustic behavior of *Inia *and *Sotalia* dolphins. I am working under the advisement of Dr. Laura May-Collado and Dr. Maria Luisa da Silva. Now Dr. May-Collado and I are working on how *Sotalia *vocalizations may vary along the distribution of the genus as well as intra-population variations. For the time being we have various collaborators along the Brazilian coast and Mexico, but we still need collaborators in French Guiana, Guyana, Nicaragua, Peru, Suriname and Venezuela. We are asking our collaborators for 10-15 hours of recordings (if possible), selected from their database in order to obtain a more representative sample on group sizes and behaviors, collaborators will be acknowledged as co-authors on the publication. We are going to run the analysis on Beluga and ARTwarp these tools allow us to extract and compare the whole contour of the sounds, and have showed excellent results on the differentiation of calls from bottlenose dolphins and orcas. If you are in one of the countries listed above, or another country, but willing to collaborate please contact me (botogabriel@gmail.com) or Dr. May-Collado (lmaycollado@gmail.com). Best regards, Gabriel Melo-Santos -- Gabriel Melo Alves dos Santos Doutorando em Teoria e Pesquisa do Comportamento (Ecoetologia) Universidade Federal do Pará BioMA - Biologia e Conservação de Mamíferos Aquáticos da Amazônia LOBio - Laboratório de Ornitologia e Bioacústica (91)8077-2763 "(...) As we bandy round solution celebrate our evolution That antidotes our stations today And as we activate our nation As we're joined by our companions we ignite our generation today (...)"