|Exclusive! Using the results of a study on Bluebirds' nutritional needs as well as guidelines developed by the bird curator of the Minnesota Zoo, we formulated this mix from peanut butter, sunflower seed, dehydrated cherry bits and rendered suet. Nutritionally balanced, it provides a great dietary supplement for Bluebirds. And when tested, Bluebirds chose it over other feeds by nearly 2 to 1! Use it year-round and watch Bluebirds flock to your feeder, as well as Finches, Orioles and even Woodpeckers.