Playing dead?

I was talking to Dr. A today about our little experiment, where we poked each pupa to see if they would respond to touch. Not a single one of our pupa responded to touch, but when we left them alone, they began moving (hence, we were able to determine that they were in fact, very mature larva, not pupa).

Dr. A said that while most pupa will respond to touch, many have a defense mechanism- when prodded, they will 'play dead'. Who knew?