I'd like a phonecard, please http://thisav.fun/ thisav.com But they are not as sweet as they look. Hummingbirds are loners, extravagantly territorial. Rival males body-slam each other mid-air and lock beaks, spinning in a circle until they hit the ground. Males show off their colours to a female by flashing their feathers, zooming 60ft into the air and diving down to an inch above her head. They do this to chase off predators, too, so the female needs strong nerves: she is courted by aerial displays that can see off a hawk.