As with alot of people I don't believe animals are color blind. I do believe maybe some respond to some colors more than others. My ball seems to prefer red. Anytime he sees anyone or anything with red or wearing red he comes over to investigate. I have noticed that alot of animals are "stimulated" by red. I have noticed that bright colored lures and stripes of red seem to attract fish when I'm fishing. I used to have a couple of Cockatiels and even a Nanday Conure and they ALL liked the color red. It may or may not, as I theorize, trigger a feeding stimulus too.