Male Costa’s hummingbirds have distinct purple throat feathers that resemble an overgrown mustache. To charm females, they spread these iridescent mantel feathers and perform acrobatic dives accompanied with a high-pitched whistle. Yes, these handsome males whistle at prospective ladies, but it’s totally permissible in hummingbird culture. May is the perfect month to see Costa’s hummingbirds in California’s chaparral and sage scrub habitats, so keep your 👀 peeled. #hummingbird #california #nativespecies #prettybird #sandiegozoo #whistlewhileyouwork ⠀⠀⠀⠀⠀⠀⠀⠀⠀ 📷: Mike Wilson