Some female butterflies can see an extra ultraviolet colour

The ultraviolet spectrum is more intense for female red-colored postman butterflies than it is for males.
Although many animals can only see one color of UV, it is not common for some species to be able to see multiple colors. According to Susan Finkbeiner, California State University, Long Beach and Adriana Briscoe, University of California, Irvine, mantis shrimps and hummingbird-hawkmoths might also see multiple colors of UV.

Finkbeiner trained 80 Heliconius Erato, an American butterfly, and 120 other butterfly species to drink from a feeder.