There was a constant battle over the feeders between the Green-breasted Mangos and the bees. For that matter, all the hummers at the Rancho in Costa Rica faced the same dilemma. That battle ensues wherever there are hummingbirds and hummingbird feeders although I’ve also witnessed hummingbirds reacting to bees at flowers both in my backyard and in Costa Rica. The female Green-breasted Mango backs away from the feeder as a large bee approaches it.