If you think something is wrong with this Toucan's eye, your concern is appreciated, but everything is fine. Birds have a third eyelid that is more of a membrane than a lid as it is translucent or semi-transparent. It helps them clean their eyeholes or reduce glare and wind without the worry of fully blinking. I just happen to catch this shot at the right time while this membrane was exposed, making the Toucan look a bit ominous.
BAM☺︎
