Question: why are bulls colour blind?

James Pope answered on 27 Jun 2012:

Hi whocares,

Bulls can’t see the colour red (they charge at the cape because of the way it moves in bullfighting, the colour is for show to the humans), but they can see in blue and green based colours (any colour that is blue, green or made by mixing them such as yellow) as they lack the colour receptor in the eye that see’s red, but they have the two for green and blue!