The mythical Tucuxi Dolphins of Talamanca, Limon, Costa Rica. The Tucuxi dolphins are shy and timid, unless they are partying with bottlenose dolphins. They are probably Costa Rica´s smallest dolphin and they seem to swim mostly in the area of turbid, murky water that runs from the Sixaola River to Punta Mona on most days. They sometimes venture up the Sixaola River. Unique to the world, here in Costa Rica, Tucuxi dolphin interact with bottlenose dolphin in social ways on a regular basis. The area they swim expands greatly when the sea is rough and plenty rain and river runoff makes the sea brown.