Confusing Color Optical Illusion

As quickly as you can, say the color of each word. (For instance, for the word "red," you will say "green.") Were you confused? Probably!

Experts aren't sure, but many scientists believe that one reason people have difficulty with this puzzle is because your brain is "primed," or prepared, to picture things the same color as the written word. (That's why this is called a "priming" illusion.) So if the word "red" is actually colored green, then that makes things confusing!

While most humans can see color, scientists aren't sure which animals can.

One possible clue is that if an animal is brightly colored, the species can probably see color. That would make sense: Color is a way some animals attract mates.
-ngk