Kaytee Mealworms are an excellent, high-protein food source for many wild birds. They are a high-energy treat that will attract bluebirds, wrens, robins, chickadees, woodpeckers, cardinals and more that are difficult to attract with traditional seed blends. In addition, they are an important source of food for baby birds. Mealworms can be used alone in a feeder or mixed with your favorite wild bird seed.