Do your gliders make like a little squeeking noise when they eat something they like, my hubby says Stuart makes happy squealing sounds when I give him his treats like yogurt or mealies. Also when cleaning his face and hands it sounds squeaky but also like he is spitting like mom use to do before cleaning our faces off. Is he spitting when he cleans his face and hands?
When he has been holding something he likes he cleans each finger like he had just eaten juicy barBQ.

sugiemom to Stuart

They do indeed chirp and warble when happy. Yep! They do spit into their hands to groom themselves. ☺