i notice sometimes when my koliba and congicus eat if they open and shut their mouths really really fast, theres like a pair of "trap door"-like flaps on top of their head behind and between their eyes that flop up when they snap their jaws. has anyone noticed this? maybe anne can gimme a solid answer on what this is and maybe she even knows the purpose(and then add it to the anatomy section), i've attached a picture of what i'm talking about
