Hummingbirds are truely amazing little aviators. Feeding is a full time job for hummingbirds. Hummingbirds also need protein to help build muscles. The hummingbird's tongue has groves on the side, which help to catch insects. Hummers have a great memory, they do, in fact, return each year to their previous feeding source.
Hummingbirds communicate with visual display.
Mostly in the ritual of courtship. Diving displays are only done by the male hummingbird, trying to entice the female hummingbird or mark their territory. Whether in courting or protecting a feeding source they are very aggressive. The female hummingbird tends to, building the nest and feeding the young. They meet on neutral ground for mating.