Cattle
A mistaken idea about cattle (mostly bulls) is that they become angry when they see the color red. This is not correct. Cattle cannot see red, because they do not have red receptors in their eyes. They can, however, see colors such as blue, yellow and green because they have yellow and blue receptors in their eyes. This mistake comes from seeing Matadors or bull-fighters using a red cape to encourage a bull to charge at them. But really, red is a color that is only used as part of Spanish tradition and culture. It is also a way to make the matador more visible from the crowd, and enables people in the crowd to easily see what is going on, and also as a way to excite them. Thus, it is merely the motion of the cape that makes a bull charge, not the colour. An angry bull or bull that is threatening you will charge if you move or if something, no matter the color, is waved in front of his face.