To prevent ants from competing with your hummingbirds for the sugar water, try placing an "ant moat" on top of the feeders. Moats come in different shapes and sizes. Simply fill the moat with water and hang it on top of the feeder. Ants can’t swim, so they won’t be able to reach the feeder. Periodically clean debris out of the moat so the ants don’t create an ant bridge to the feeder over their dead comrades.
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