This is one of the more unnerving enemies in the game. It's some sort of zombified roach that stands on its hind legs and walks slowly towards your Pikmin, leaving behind a trail of poison gas that fades after a few seconds of lingering in the air. Its face is concealed by a structure that looks almost like a gas-mask filter. Could this mean that the creature is vulnerble to its own poisons and needs to filter them as it breathes? Anyhow, these things are easy if you just take them out with whites. Otherwise, they'll create too much deadly gas for any Pikmin to deal with.