The Glass Frog
The glass frog is pretty unique, and it’s not because of how cute they are. These cool animals look like normal frogs on top, sporting bright green colors, but they have translucent bellies if you turn one over. That means that you can see all of the frog’s organs. So what reason would they have to be translucent? Scientists discovered that the frog’s legs changed in opaqueness depending on the amount of light, and when they tucked their legs close to their sides, it was much more difficult to see where the outline of the frog was. That made it more difficult for predatory birds to find them.