28. Flatfish one-sided eyes
There are numerous types of flatfish in the ocean. The types that fall under this are the flounder, halibut, sole, and many others. You’ll notice a key thing most possess, both eyes on one side of their body. The question is, why in the world would this even be useful to them? Technically, this seems like a drop where evolution went the wrong way.
Yet in one of the key ways evolution is proven to us here, flatfish actually use this development to their advantage. They evolved to have both eyes on one side so that the other side could be on the ocean floor. This allows them to hide without predators seeing them with ease and even helps them surprise attack prey for food as a hunting technique. This eye transition of theirs actually begins while the flatfish is young. One eye slowly moves up and finally over the top of the head.