i don't think all rats boggle...different rats show their happiness in different ways. my ratty Baby bruxes a lot but i haven't seen her boggle, while Vegas often boggles when she gets around to bruxing.
although i think anything rats do to show happiness is super adorable. xD
I am pretty sure that the muscles used for bruxing in the jaw are attached by the eye and at the end of a bruxing they boggle.
Then they stop and start again. Its soo sweet, and I warn newbies that "No, your rats eyes will not pop out..." :roll:
Yep...badly worded from me but here's the description from ratbehavior.org
Eye-boggle (eyeboggle, boggle): Eyeball vibrates rapidly in and out of the socket. Occurs during high-intensity bruxing (soft, repetitive grinding of the incisors). The rat's masseter muscle, which passes through the eye socket behind the eyeball, moves the jaw rapidly up and down during bruxing. When bruxing is intense, the contractions of the masseter vibrate the eye in and out of the socket in time with the incisor grinding. Usually considered to indicate pleasure and contentment.
Boggling is always a good sign, whereas some bruxing is stress/fear/pain related.
i need to actually go out and get another one of those hammocks. They had for close to year and are just now really starting to love it. Figure I better get another one before they destroy this one. Its nice to be able to re arrange it so many different ways.