This adorable little creature goes by many names…woolly caterpillar, woolly bear, woolly worm, fuzzy worm…etc. No matter what region you live and by what name you call them, we guarantee these little ones remind you of being a kid. Even today the theory of their weather predicting powers follows them, probably making them one of the most recognized caterpillars around!
Other than being deemed a winter weather forecaster, what else do we truly know about them? While we only seem to pay attention to them in the fuzzy portion of their lifecycle, there is much more than meets the eye.
Let’s start off by saying, these caterpillars are neither woolly nor bears. I know, that is blatantly obvious, but we needed a jumping point. Although they may look soft and fuzzy they are actually covered in short and stiff bristles, which may cause a reaction in those with sensitive skin, so be careful! Perhaps they earned the bear moniker because they hibernate in the winter similar to bears. No matter the namesake, they are generalist feeders, meaning they will feast on a variety of nature’s offerings. Another part of their appeal is that they don’t bite when we pick them up, right? Favoring leaves, they are also known to munch a great deal of weeds, clovers, dandelions and nettle. While they love to eat, their main focus through their travels is to find the perfect spot to hibernate so they can continue their evolution.
Evolution you say? Yes, evolution! Just as other caterpillars transform into beautiful and enchanting airborne creatures, the woolly caterpillar will eventually earn its wings. However, this happens in stages. First, when the weather turns colder, the woolly bear will seek shelter in an inconspicuous hiding spot and start its hibernation. This is where things start to get interesting. This caterpillar develops a sort of internal antifreeze to protect its internal vital bits, while the rest of it will freeze solid over winter. Armed with this incredible survival tactic, they can endure temperatures as low as -90°, and we thought running to our cars during the polar vortex was bad!
As soon as the temperatures approach 50° or so, the woolly bear will thaw and start foraging and gorging to store energy for its next phase. When it’s satiated, as if it couldn’t get more interesting, it will spin a fuzzy cocoon, out of its own fur! Flash forward 10-15 days and it emerges as an Isabella tiger moth. Although not as majestic looking as common North American monarchs or painted lady butterflies, this moth can be identified its yellowy-orange coloration, black legs and small black spots on its wings and thorax. For the rest of its adult life, it will -bad pun alert- fly under the radar, and blend into the sea of many. We suppose after being so popular as a caterpillar, the mundanity of everyday moth life would be a nice change of pace.
Now to get to what is on everyone’s mind…how did these creatures become associated with weather forecasting and is it really true?!
The winter weather prediction has been a part of American folklore since the colonial times, but it was only popularized in the masses in the late 1940s. Entomologist Dr. Howard C. Curran, was the curator of insects at the American Museum of Natural History in NYC at this time, and he decided to put the legend to the test. Heading to Bear Mountain in New York to conduct his studies, over half of the woolly caterpillars collected had wide orange bands in their fur, meaning that the winter would be more on the mild side. Dr. Curran reported his findings to the New York Herald Tribune and the story took off! While he tried to prove the theory for 8 more years, it was never truly concluded that this caterpillar was a true forecast clairvoyant.
However, through the deep examination of these critters, a few fun tidbits were discovered.
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