Chalk-browed mockingbird (with the brood parasite shiny cowbird)

Your spotting has been nominated for the Spotting of the Week. The winner will be chosen by the Project Noah Rangers based on a combination of factors including: uniqueness of the shot, status of the organism (for example, rare or endangered), quality of the information provided in the habitat and description sections. There is a subjective element, of course; the spotting with the highest number of Ranger votes is chosen. Congratulations on being nominated!

BrunoMoller, please make this excellent spotting even more useful by adding a reference about brood parasitism.