That's really interesting. Cats are supposed to see green better than most other colors. Yet, my cats' favourite toys all seem to be orange or red -- including the laser pointer. I wonder if they can see the green laser well enough to know that it's just a dot of light, but not so the red laser. Or possibly, since green is the colour of plants, etc, their hunting instincts filter it out, since they're looking for the non-green moving thing.