Hummingbird Deception

Article describing how male Costa's Hummingbirds manipulate their feathers and positions to impress mates as to their speed of dive.    Charts show just how they do this.     http://www.dailymail.co.uk/sciencetech/article-5614335/Male-hummingbirds-sing-tail-feathers-high-speed-dives-woo-potential-mates.html