Ignoring the doves and passerines sharing the habitat, the duck, amused to see a potential mate, bobs his head and lets out a series of shrill cries – resembling the honk of an ice-cream truck. The female moves away just enough to signal indifference, but not rejection. That hint of interest is enough for him to continue the courtship ritual. Soon, she responds with head-bobbing and calls of her own. These are not ordinary ducks.