During daylight there are pigment cells that cover the reflective crystals to minimise the amount of light they receive.In low light the pigment cells retract and the crystal plate adjust to reflect light back on to the retina to amplify the strength of the image.This mechanism allows the shark to hunt its prey at night effectively.Pigment cells absorb some of the light during the day to avoid absorbing too much light that could damage the eye. During the night, pigment cells retract and allow the crystal layer to reflect light on to the retina that would have been missed when it first passed the retina. Eyes: Barn Owls have large and forward facing eyes, this allows the owl to have excellent vision as they can see the height, width and depth of an object.To do this Barn owls have specialised sensory adaptations to make them effective predators. Eyes: A sharks eyes are very well developed as they can detect colour, light contrast and detail.Behind the retina is a reflective layer of mirrored crystals.
Sensory nerves in the skin allow mammals to detect touch and contact with objects in their immediate environment.
Ears: Sharks have internal ears which provide information about the speed the shark is swimming and how sharp a turn to make.
This information is passed on when water flows into the otoliths when they are moving.
The facial disk around a barn owl’s face allows sounds to be channelled into the ear openings and can be altered by facial muscles to obtain a more accurate detection of sound by allowing more sound to go into one ear opening than the other.
The facial disk also filters out background sounds that could inhibit the owl when hunting prey.