When actively trying to remain inconspicuous during the day, how does the Northern Potoo adjust its large eyes?

Answer

They narrow significantly to mere slits

To enhance the illusion of inanimate wood, the large eyes that aid in nocturnal navigation narrow down significantly when the bird is roosting during daylight hours.

When actively trying to remain inconspicuous during the day, how does the Northern Potoo adjust its large eyes?
birdfaunawildlifecharacteristicpotoo