This Buff-belly was frequenting the same yard, and feeder, as the Mango. They had a couple of altercations, with the bigger Mango coming out the better. These charismatich hummers are one of the many treats of a trip to south Texas. They were much more widespread this time, compared to my previous trip down here in 2003.
Note that this is the same feeder that the previous shot of the Mango was taken on, the size difference is apparent when comparing them to the feeder.