Haha, they can roll their eyes back and so it seems like winking or blinking but they aren't ^_^ They don't have eyelids so it's impossible for them to actually "blink" but they roll their eyes around looking for predators/food. All Corydoras, Plecos, Loaches, and Garras can do this. I'm sure I'm leaving a few out of that list but those are the main fish people keep
The bigger the cory, the cooler it looks; that is the top thing I miss about my Brochis splendens (emerald catfish, not technically corys but close enough). Their eyes could tilt very far down to the bottom.