Opening their mouths to regulate heat

[JacksJill]

I completely understand. You can slow hornworms growth down by putting them in the fridge for 24 hours. Don't go much longer or you risk loosing them.

 

[Franquixote]

They are in a 64-5 degree room, I keep heating pads under the feeders but want them in the cold so they don't get any bright ideas about staging a prison break.