Bill Oddies Nutri-boost is a high energy food to give birds a boost all year round. For all birds & especially blackbirds & tree sparrows Bill Oddies Nutri-boost is a great energy source packed with nutritious ingredients like sunflower hearts black sunflower & peanut granules. Bill Oddies Nutri-boost gives hungry birds all the goodness they need to keep going during the winter months & in helping them prepare for the breeding season.