Thanks to Christy Elizabeth for sharing this pic of a hickory horned devil caterpillar on Lake Mercer Trail. Mature hickory horned devil caterpillars are quite large and can grow up to 5.5 inches - roughly the size of small hot dog. pic.twitter.com/Qy21YXAWRT
— Fairfax County Parks (@fairfaxparks) October 12, 2019
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