The Eyes Have It L et's look at our eyes.
Humans have muscles in their eyes.
Not all animals have these muscles in their eyes. Owls cannot move those magnificent big eyes. If an owl wants to see something off to the side of its head, it needs to turn its head from side to side. Owls do have an excellent sense of sight, and they also have a layer of reflecting cells at the back of their eyes, so that the light passes through the eye twice, allowing them to see in dark areas better. Here are two fun experiments you can try.