 Petal carrying might also be a way for extra males to gain matings with the female.In either case, the data does not strongly link petal-carrying and presenting to a copulation soon thereafter.Researchers at Department of Ecology and Evolution, University of Chicago published a paper in "Behavioral Ecology" in 2010 showing that male splendid fairywrens sing display-like vocalizations (Type II song) in response to predator calls.