Radioactive Slooch

The Radioactive Slooch is a member of the slooch family that is found in Pikmin Z. It mirrors the appearance of a typical slooch except that it has glowing green stripes. The best strategy to defeat the creature is to simply swarm it with Rust Pikmin. Make sure the other types of Pikmin are well away from it to avoid getting poisoned.

Biology
The Radioactive Slooch is a species of slug-like creatures. It has evolved to become highly toxic, with the poison coming from the various rotten items and carrion it finds as food. It slowly goes after Pikmin and any Pikmin that touches it will end up severely poisoned except for Rust Pikmin.
 * Diet: carrion
 * Predators: ???

Piklopedia entry

 * "The radioactive slooch is a rather strange species with radioactive skin, which it gets from all the rotten, poisonous food it eats. Its digestive system can break down the strongest bacteria, and the poison it secretes is strong enough to topple a spotty bulbear."