Image: Leo Reynolds
The square pupils of goats attract a lot of attention, but they aren’t just there to look pretty. The width of the pupils allows the animals to see at a 330 degree angle, as opposed to humans who generally see at around a 185 degree angle.
Image: Rainforest Harley
Frogs are well-known for their big eyes, but few people know why their eyes bulge out. They can protrude their eyes to help them see above the surface while they are underwater. When they close their eyes, they pull them back, where they are covered by a top opaque eyelid and two eyelids made of of thin, translucent membrane.