Cats have fewer photoreceptor cells in their eyes compared to humans (also known as cones). This means that they are not able to see clearly-defined colors or finer details. Instead, they have a tapetum which reflects light back off the cones, giving them the ability to see in the dark. Our domestic felines can only see variations of blue, green, and red. So, they are more likely to watch cat tv programs that are predominantly these colours (with swiftly moving objects too of course!). Funnily enough, children's programs are more likely to display bright contrasting colors like these. So, don't be surprised if your cat becomes engrossed in Peppa Pig from time to time!