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This would indicate it'sThis would indicate it's random: "http://www.weatherworksinc.com/woolly-bear-winter" We have found a lot of all black wooly bear caterpillars this year in north east Ohio. Guess that means we have lots of YOUNG ones?

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?