This week we have been exploring all the ways birds’ ability to perceive colors on the UV spectrum comes in handy! Last on the menu is migration. How birds know exactly where to go is fascinating and there are a number of different theories [http://ow.ly/HQQ750H617l] as to how they do it. One suggests that they not only navigate using the Earth’s magnetic fields, but that they can even see them! This is made possible thanks to special photoreceptive proteins called cryptochromes, found in birds’