From July to late fall, territorial claims can be overlooked, and competition at feeders increases greatly. Hummers forage for food 20% of their time and perch about 80% of their life. In order to conserve their strength, sometimes they’ll guard a particularly tasty food source like a hummingbird feeder or flowering bush. This might result in air fights between hummingbirds or any birds that get in the way of their meal. It's also not unusual for more mature hummingbirds to use physical rebukes to punish immature hummingbirds. It is okay to put up a couple feeders at different locations of the yard to relieve the stresses of late summer feeding.
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