What function do the slits in the potoo's eyelids serve?

Answer

To maintain a degree of visual access while enhancing disguise

These specialized slits allow the bird to maintain visual access to its surroundings while keeping its eyes sufficiently closed to enhance its camouflage disguise.

What function do the slits in the potoo's eyelids serve?

#Videos

Potoos Are Hauntingly Cute - YouTube

birdcharacteristiccamouflageavianNocturnal