The Caustic Dweevil (ルリショイグモ) is a member of the Dweevil family, a non-aggressive found in Pikmin 2 that attacks in self-defense. As it's typical of Dweevils, it picks up any treasure or enemy body it can find, only releasing it when Pikmin attack. The only offensive measure the beast can take is spraying an acidic bodily fluid on enemies, which drowns all Pikmin types except Blue Pikmin, making them the best choice in battle against it.