Big problems come in small packages. Emerald Ash Borers start out as larvae that eat a tree from the inside out, keeping water and nutrients from getting to the right places. Not only do the larvae kill and weaken trees, they attract woodpeckers looking for a snack.
Borers were first found in Michigan in 2002, and likely hitched a ride to the United States in packing material sent from Asia. The bug, which flies from tree to tree spreading its eggs, is just one of the ills that affect trees in the United States. Climate change is likely to help spread borers -- as well as other bugs and diseases -- to new places, scientists say.
Photo via Michigan State University.