The rosy wolfsnail (Euglandina rosea) is a voracious predator. It devours other snails and slugs, and because of this trait, it was introduced into Hawaii in 1955 to control the numbers of invasive African land snails. Unfortunately, the African land snail grows to a very large size and, when it gets that big, the rosy wolfsnail wants nothing to do with it.
Instead, the rosy wolfsnail took a liking to the much smaller indigenous snails and proceeded to wreak havoc on their numbers. It’s now on the International Union for Conservation of Nature’s list of the top 100 worst invasive alien species in the world.