Only shot I got with the tail raised, crest is raised too. That is a boldly colored, flashy undertail. More interesting facts from the Cornell site: "Roadrunners have evolved a range of adaptations to deal with the extremes of desert living. Like seabirds, they secrete a solution of highly concentrated salt through a gland just in front of each eye, which uses less water than excreting it via their kidneys and urinary tract. Moisture-rich prey including mammals and reptiles supply them otherwise-scarce water in their diet. Both chicks and adults flutter the unfeathered area beneath the chin (gular fluttering) to dissipate heat. "