The Season's SuperFood for Your Birds. During nesting season, bird moms need all the energy they can muster. You can help by filling your feeders with Nesting SuperBlend™ available exclusively from Wild Birds Unlimited. It provides birds a super-boost of the protein and calcium they need as they build a nest, lay eggs, raise their young, and go through their post-nesting molt. Shop our store to learn how you can make life a little easier for birds this season. And how you can attract more beautiful birds to your backyard.