There’s no mistaking the dizzying display of a hummingbird’s wings as it zips around from flower to flower looking for nectar. But often, that same frantic action is used to chase other hummingbirds.

Ruby-throated hummingbirds will soon return to New Jersey to begin a new breeding season. You can track the hummingbirds' spring migration with Hummingbird Central's interactive map. To support ...