Hello! You recently reblogged a Hercules beetle pupa and I was wondering if you would be able / inclined to maybe explain why a part of it moves in circles like that?
Sure! I don’t know if you were a kid like me who enjoyed unearthing moth pupa and harassing them so that they wiggled (like this), but it’s the same principal. Basically, it’s a last-ditch defense mechanism to try and deter predators who may be startled when that tasty-smelling brown thing starts squirming.
One of the most extreme examples of this is the daring owl-butterfly (already a cool name), which not only squirms, but creates a pupa that looks remarkably like the head of a venomous snake.