There are many weird creatures in the ocean, especially as you go deeper. Cock-eyed squids, as their name suggests, have two very different eyes—each detects a different type of light, and points in a different direction. The mesopelagic zone starts at the depth where just 1% of sunlight penetrates and extends down to the point where no light reaches at all; so this is a cool adaptation that allows the animals to survive in a very low-light environment. Interestingly, the eyes are the same at birth, but the left one morphs as it grows.