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I have tried "everything" over the years to keep ants out of my hummingbird feeders without success, but have finally solved this problem. As usual as soon as the weather warmed up they arrived in great numbers. I used a wire to hang the feeder, and then twisted an old fashioned fly strip around the wire above the feeder. It has been in place for about 2 months now and not one ant have I seen. 
Source: My daughter helped me figure this out.
All websites warn against using anything sticky or greasy. It's possible that when the birds squabble one could accidentally fly into the glue.
This is very good news. Thank you!
A hummingbird, could get caught in the flypaper, couldn't it?
It is not impossible, but very unlikely as they come straight to the feeding tubes at the bottom of the bottle. However, if you are worried that this might happen, just lengthen the wire extension, or cut the flypaper off. It only needs to be a few inches long rather than the full length that is shown in my posting.
Harlean from Arkansas
