Green swordtails (Xiphophorus hellerii) have colorful lateral stripes. In one population from Actopan in Veracruz, we detected that they can actually change the color of the lateral stripe. Dominant males sport a red stripe, whereas subdominant males show a brownish, black stripe. They can change color within a few seconds to minutes. This was first discovered by Sam Rhodes and a follow up study by Elizabeth Hardy is about to be published in Ethology. Click on Color Changing Swordtail to see a short movie filmed by Sam Rhodes.