Bluebird Feeders Having bluebird feeders in your yard is a great way to attract these beautiful wild birds. Watching them feed will provide you with hours of backyard birding enjoyment. Feeding bluebirds is not as difficult as you may think. In nature they eat a variety of insects, as well as fruits and berries. Bluebirds are hard to attract with bird seed, but they love mealworms. Mealworms are not really worms at all; they are actually the larval form of the darkling beetle.