Here in the Amazonia it is said that a stranger sometimes appears at the village festivals in the small villages, which are celebrated at full moon.

He is always dressed in white, wears a hat and uses every opportunity of looking for a lover. And at each of these celebrations he manages to find a girlfriend.
He takes the girl with him to the riverside. And then he disappears without a trace into the water, without you noticing it, and leaves behind the smitten girl.

Afterwards everyone realised that the man dressed in white was actually a Boto, who uses his hat to cover the blowhole on his head.