Tetrachromatic Humans See 100 Times More Colors

Lots of animals are tetrachromats, including birds, fish, amphibians, reptiles and insects, but only a handful of human tetrachromats have been identified since 2012. This increased visual ability does come with a disadvantage of offspring having a high likelihood of color-blindness. Continued research may help scientists find a way to improve the vision of the (much larger) portion of the population that suffers from color-blindness.
More information on scientific studies of human tetrachromacy can be found here.