The Botu Man

This weekend we plan to take the Amazon River tour to see where the Rio Negro and the Rio Solimoes come together to form the Amazon. The two rivers are different colors--black and yellow--different temperatures and different densities, so the contrast is apparent before they mix for some 6 kilometers.
Today I was speaking with one of our tech support staff, Monica, and she told me that you can see the river dolphins, botu, jumping back and forth from the black side to the yellow side. But she said she is scared of botu dolphins, because they are "wild animals" they are unpredictable and she would be scared to swim with them because they could drag you off down the river. I asked Monica if there were any incidents like that and she said she didn't know if the stories were true or not.
Then she told me there was one story about botu though. When a woman in Brazil is pregnant and doesn't want to say who the father is, she will sometimes say, "The father is Botu." Apparently, as lore would have it, on full moon nights a botu can appear as a very handsome man, dress up, come onto land, and then romance women. They are supposedly very good dancers, and they will lure women to the river, and then take them away. The women will come back pregnant with the Botu man's baby. So Monica said when she was younger, she would check the top of any good looking man's head to make sure he didn't have a "hole for resperation". "I don't go dance with man who has hole in top of his head," she declared.