[Imbottirsi il pacco, versione colibrì] "male Costa’s hummingbirds can twist half of their tail feathers in the direction of the female, manipulating the volume and pitch of their chirps (see video). The researchers suspect that the targeted noise also masks audio cues that the females can use to judge how fast the males are diving." https://www.nature.com/ar... https://youtu.be/QLVeyyX4...
