A different way of seeing things

Animals do not necessarily see things the same way that you do. While we have three cone cells which allow us to see colour, some birds and fish have four types of cone cells, so their colour vision could be described as more precise than ours. Owls, however, like many other nocturnal animals, have no cone cells. While they have excellent vision, they perceive the world in black and white. Bug zappers use ultraviolet lights to attract mosquitoes because they see the short-wavelength violet and ultraviolet light, but not yellow or orange. And you know how a matador uses a red cape to entice a bull to charge? Well, the colour is for the spectators. Bulls have only two kinds of cone cells and they do not perceive red as a colour at all.