Sometimes when my 2 males have just there heads sticking above ground and are just chilling it does actually look like they are using there vocal sacs as pillows, looks kind of comfortable to them. But my 2 females never look like this. There throats are always nice and tucked up like there supposed to be, if that's the right way to describe it. Which reminds me I need to update my profile because I only have the 2 males and one female listed.