Drab Prominent (Misogada unicolor) larvae, taken August 21, 2023, in Georgia, US
Circles!! Curling up into a ball is this caterpillar's main defense mechanism, which doesn't really work well on humans... I find their patterns quite pretty, and they have lots of individual variation! They get their common (and scientific) name from their adult form, which is an almost patternless light beige.