Tribelle
A Tribelle, also known as a Heebie-jeebie [source], is a small female butterfly that is found hidden in various places in Rayman 3: Hoodlum Havoc. It is red and yellow in colour, and gets its name from the three leaf-like parts on its head. While they make a distinct shimmering sound when the player is near, they are very shy, so the player has to approach them very slowly and quietly, so as not to startle them. If startled, they will will disappear. If approached correctly, they will add 250 points (by default) to the score.
It is unknown if there is any connection between the tribelles and the popolopoï, another species of butterfly native to the Glade of Dreams. It is also unknown if either species of butterfly have any connection to the shadowy caterpillars encountered throughout the series.