A male American Redstart’s song attracts attention from potential mates, but his plumage matters as well. When a female redstart selects a mate, colorful males are more desirable than duller males. And brighter males may also sire young with “extra-pair” females as well. Are you looking for the most comprehensive online learning course about warblers? Enroll in "Be a Better Birder: Warbler Identification" and get access to tools, tips, tricks, and resources from Cornell Lab experts—all at your o