I got a message from a visitor of this website asking if I know what could be up with this caterpillar he found. He attached some pictures, and I couldn’t believe my eyes! I had never seen such a creature! He mentioned it was a Hickory horned devil caterpillar. Check it out:
It’s the largest caterpillar species in North America, growing to about 6 inches. Right now they are leaving their trees to dig a hole in the ground where they will pupate. As a pupa they will survive the winter to emerge as a regal moth next spring. Hickory horned devils are greenish blue in color with large orange spikes near their head and smaller black spikes all over their body. When they are born they are completely black but already have their spikes. They are completely harmless to humans.
The Hickory horned devil is more beautiful on this -a bit dated- video: