Hello – I do know my bug is a caterpillar of some sort but what I want to know is what is happening to this creature. I live in south east Arizona and the caterpillar is common here but I have never seen one with the white “larvae” attached to it. It is alive and was perched on a mesquite tree branch when we found it. Do you have any ideas? Thanks you…
Your Juno Buckmoth Caterpillar, Hemileuca juno, which we matched on BugGuide, has been parasitized by a tiny Braconid Wasp that laid her eggs in the caterpillar. The young wasps fed on the caterpillar and then pupated outside. Sadly, the caterpillar will die.