All hail the woolly worm, harbinger of winter. The annual migration of the wooly worm caterpillar has begun, a sure sign that autumn is upon us. Sign up for our Newsletters Also known as ...

Wasps and flies inject their own eggs into a caterpillar's body for growing larvae to feed off its internal organs. But the woolly bear caterpillar (Grammia incorrupta) is one of the only recorded ...

Michael Singer at Wesleyan University discovered that, when healthy, tiger moth larvae, also known as woolly bear caterpillars, focus their diet on nutrient-rich food, but switch to eating plants with ...