Wooly bears show up this time of year.
On a warm October afternoon bears were in our yard! Not to worry. They were wooly bears. Caterpillars. We like them and follow them as they scurry along as fast as their tiny legs can go.
Where are they going and how do they know how to get there? The answer to the first is simple. Wooly bears spend the late summer munching on plant debris, but when nights cool, they sense winter’s onset.
A wooly bear wandering around in October is looking for a snug place to overwinter. That could be in a rotting log or tucked under a porch. We often find them in January tucked in between chunks of firewood. When we discover one, we gently move it to another nearby safe spot so we can continue bringing in wood and it can continue slumbering until spring.
How Do Wooly Bears Know?
We can’t explain how they know where to find a place to overwinter. Maybe it’s a random search or somehow, they can sense safe places. It’s a fascinating mystery of nature.
What ARE Wooly Bears?
Wooly bears are cold-blooded, so their “wool “doesn’t help them stay warm. They have an amazing survival strategy. As the temperature drops to freezing a wooly bear’s heart stops beating. Then its gut freezes. Then its blood freezes, and soon the entire insect is frozen solid. Fortunately, frost crystals are outside its cells, so when warm weather arrives the wooly bear thaws and goes about its business.
How Many Species Are There?
There are eight species of wooly bear in North America. The adult phase is called an Isabella moth.
Predicting Weather
Winter Predictor?
Wooly bears are fun. We love watching them cross our driveway and twist their way through grass stems each fall. Can they predict the severity of the oncoming weather? Some people think so and carefully examine the bands of color on the caterpillar’s bristles that look like wool. We don’t take chances on wooly bear weather predictions and keep plenty of firewood on hand.
Woolly Bear Festival
Vermillion, Ohio, treasures its wooly bears. So do the 150,000 people who attend the Woolly Bear Festival, held annually in late September. It may be the Ohio festival attended by the most people.
