No moths do not 'buzz'. I have had hummingbirds try to feed from my tomatoes, perhaps eating the thrips more so than nectar. June bugs and Japanese Beetles are large and will 'buzz' while flying.
Since you say that you were watering, I think that it was a newly fledged hummingbird. They are attracted to the sound of the water and like to play in the spray that I make with the hose. It is that time of year when the babies emerge from the nest. They are out exploring and will come up close to check things out.
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~ Patti ~
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