"The third eye exists"
Some reptiles and birds have a sort of third eye on the forehead. In fact, it is a point where the skull bone is so thin that allows passage of light, leaving the impression that these animals have a kind of calendar that records the current season. Those ducks which were covered with a hat that place no longer know when it's time for brooding, or when it is time to gain weight for winter. Perception time to them was totally jammed within that experiment.