Amazon river dolphin
"Yacuruna" have the ability to communicate with aquatic animals of the Amazon and have ultimate control over them. Locals believe that "yacuruna" can transform into an Amazon river dolphin (commonly known as a pink dolphin) which is attracted to the odor of blood in menstruating women. Once the woman is found, the "yacuruna" transforms into a handsome and alluring man who then uses aphrodisiacs to kidnap her and bring her into his kingdom in the depths of the river.