Blackwing and his sense of sight.

[albertonykus]

There's farther.

So one would expect, however... experiments have found that mantis shrimps are worse at discriminating between different colors compared to most animals that have three or four types of color receptors. It instead appears that their color vision system is adapted for recognizing colors quickly, but not necessarily distinguishing subtle differences among different shades of color.

My post count is not high enough to link a relevant article directly, so this will have to do: nationalgeographic.com/science/phenomena/2014/01/23/the-mantis-shrimp-sees-like-a-satellite/