How can I keep bees and ants off my hummingbird feeders?

For bees or wasps, hang a bee or wasp trap (containing the same sugar water that are in your feeders to use as bait). That will collect an amazing number of pests. Also try using bee guards. The best way to keep ants away is by hanging a small ant guard above your feeder. This cuplike device is filled with water, creating a moat ants won't cross.