Native plants for a Cape Cod garden

I know, the title is an odd reference to the cybernetic antagonists in the old Battlestar Galactica science fiction series, but the male hummingbird that arrived in the garden a week or two ago reminded me of one of those robots with the red “eye” going from side to side. Said hummer went face to face with a chickadee and in a similar manner aggressively flew left to right just inches away until the relatively bigger bird moved to a different perch. That was apparently not enough for our “Cylon” and he pursued the animal relentlessly until it flew off altogether. This was near the sunflower seed feeder, not anywhere near the nectar feeder which is on the other side of the yard. I’ve seen hummingbirds chasing and displaying this behavior within the species, but this behavior toward other birds is new to me…