It is the female Ruby-throated Hummingbird that performs the aerial display to capture the males attention and signal that she is ready to mate. With other species of hummingbirds, it is the male that usually performs the aerial display in an effort to capture the females attention prior to mating taking place.
Does this fact surprise you? It did me, even though I have discovered a great deal about hummingbirds in recent years. This is the type of information about hummingbirds that I wish my mom was still alive for me to share with her.