The gypsy moth (caterpillar) is a serious defoliator of trees and shrubs in North America.
The aliens have landed in Wisconsin! You may see them and not even know they are aliens. These invaders are actually exotic plants and animals that have been introduced to our state from other countries or habitats on purpose or by accident. They can cause all kinds of problems for plants and animals that have always lived in our state. Read these stories and find out how to pick aliens out of a crowd, learn how to identify impostors, and how to help exterminate these alien invaders before they take over!
Sea lampreys are members of an ancient family of "jawless fishes" that were around before the dinosaurs.
Spiny water fleas eat zooplankton and compete directly with small fish that also need to eat it.
When spongy moths have an "outbreak," the caterpillars defoliate trees (eat all the leaves).