Vol. 9 No. 1 (2019): Revista Biodiversidad Neotropical

South American river dolphins (Inia and Sotalia), distributed in the Amazon, Orinoco, and Araguaia-To cantins river basins, are considered among the most endangered aquatic mammals on the planet (Reeves et al. 2003, Trujillo et al. 2010, Mosquera-Guerra et al. 2021). These cetacean species are currently categorized by the International Union for Conservation of Nature (IUCN) as Endangered (EN) and included in Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES, da Silva et al. 2018).