There could be a number of reasons why the hummingbirds may not be visiting your feeder. Availability of natural sources of food or nest sites could be one factor, but other possible reasons include a lack of flowers in your area, too much competition from other birds at the feeder, or a lack of accessibility to the feeder. If you're having trouble attracting hummingbirds to your feeder, there are a few things you can do to try and improve their chances.