Animals that have deliberately been introduced by humans into a place they are not naturally found only to cause unexpected harm to that ecosystem

Source: Insects to be brought in to control Japanese Knotweed

• Rabbit (Australia)
• Nile Perch (Lake Victoria)
• Mongoose (Hawaii)
• Rosy Wolf Snail (French Polynesia)
• Fly, Spider, Bird, Cat, Dog, Cow, Horse (an old lady)