eli5 how some animals can see in the dark? How do their eyes differ from human eyes?

Question

eli5 how some animals can see in the dark? How do their eyes differ from human eyes?

In: 3

Answer 1

Their eyes have sensor cells that are really sensitive to light (compared to ours). The cost is that those cells aren’t good at sensing the wavelength (color) of that light. We (along with most primates) have much more of those color-sensing cells than the “sense any little bit of light” cells than most mammals, so we have great daytime color vision, but relatively bad low-light vision.