Nocturnal animals tend to have proportionally bigger eyes than humans do. They also tend to have pupils that open more ... (Both are named after their relative shapes.) Cones work in bright ...

2,500-mile-wide “pupil” potentially residing on its surface, formed by its tidally-locked position with its host star. This means that, every 24 days, an unblinking eye, 1.7 times the size of ...