Lemongrass, you must get a lot of them during migration? i see you are located in Tx.
East of the Miss. river we have only one variety, the ruby throat and either it is the species or it's because of the nesting but they will share with no other hummers male or female. So it was nice to learn something about other variety's habits.
silvergirl, they are also very intelligent. One used to sit under our camper awning when it rained, content to keep company with humans. Last week i saw one take refuge in one of those diamond shaped spaces you see in chain link fences. It was the perfect place for protection from another territorial hummer who could not get past the 4 wire sides to deliver a flying blow to the interloper. It sat there calmly while the other one went nuts trying to get at it. LOL.