Black Lum

From RayWiki

A Black Lum is a type of Lum that was first introduced in Rayman 3: Hoodlum Havoc, and is the result of a Red Lum that had been scared. Unlike the other Lums in Rayman's world, these do not shine, and instead look like hairy insects with big bloodshot eyes and grey lips. André, the leader of the Black Lums, is the only one that has a pair of arms. When several of these form in a swarm, they would steal the fur from animals and create Hoodlums.

Once Rayman receives his grimace power from Gumsi, he is able to convert Black Lums back to red ones by making them laugh.