As the adult birds feed their young they are looking for food rich in protein and liquids. Baby birds have no access to water and it’s needed to sustain life so this is provided by live food of one form or another. If you can provide live mealworms regularly this makes hunting for the right foods easier and in turn this can mean more fledglings can survive and thrive.
We all know there has been a general decline in natural invertebrates so there are two key steps to take that will help. In the shorter and medium term supplement your birdfood with live worms (especially in the Spring) and for the medium to longer term plant native wildflowers, dig a wildlife pond and plant a native hedge to make a major difference for your birds and wildlife.