Noteworthy Caterpillar

This incredibly unique looking caterpillar, in one of its larval stages, is a  mesmerizing display. It's known as the Spiny Oak-Slug Caterpillar (Euclea norba) - despite its name, it feeds on a wide variety of deciduous trees, not just oaks. They are often brightly colored in various hues of green, yellow, orange, or red, not just the brown and white pictured above.

Here is a more colorful one I found a few weeks later

Its body has spines along it that release a toxin when they are touched - it will produce a mild sting or burn for most people. I almost picked it up to move it to a more photographically pleasing background - I guess I'm learning!

It pupates into a chunky brown moth with a green patch on each upper wing.