These little caterpillars whose faces appear to resemble masks worn by the Samurai eventually turn into a species of moths native to eastern North America. Their spike looking hairs secrete an irritating venom that causes a lot of pain and discomfort. This caterpillar has Aposematic coloration, which means they they have dark colors mixed with bright colors to warn predators that they are toxic. They produce a glue-like substance on their undersides that help anchor them to leaves to help prevent predators from easily yanking them.
I’m not big on caterpillars but this one seems to interest me for the way it looks and its defense mechanisms.