I'm going to teach y'all something today since this isn't seen very often!! Bunnies have three eyelids, the third being known as the nictitating membrane. This eyelid is translucent and slides across the eye to help keep it moistened and to help improve vision for any nearby predators. I don't see Bonbon's very often, but I have noticed that when she gets relaxed, it will oftentimes start to slide out (mostly during cuddle sessions). It freaked me out the first time I saw it, but after doing research, I know nothing is wrong with her and it helps me breathe a little easier!