The girls make some delightful little noises, like a squeaky toy, when they are, erm, feeling fruity. Its really quite comical as one lets out a squeak and the other replies with a little hissing sound! The boys just sit there listening intently to what's going on and I'm sure they are just wishing they could get it on lol
Jesse dreams and kind of grunts in her sleep. She also chatters her teeth at me in annoyance when I stop her chewing the corner of her cage