Puss caterpillar is one of North America’s most venomous insects

A puss caterpillar in Arenal Volano National Park in Costa Rica (Adriana Margarita Larios Arellano/shutterstock.com)

Not all fluff is friendly, and there’s nobody better than Megalopyge opercularis, or Puss Caterpillar, to teach us that lesson. This caterpillar looks almost unreal at first glance. It’s covered in thick, soft-looking fur that makes it res…