"Swallows are birds that are beneficial to human beings. They mainly feed on insects such as mosquitoes and flies, and can eat 250,000 insects in a few months. Wild swallows like to eat mosquitoes, flies, locusts, butterflies, moths, earthworms, caterpillars, grasshoppers and so on. Artificial feeding can occasionally feed vegetable leaves or other grains, such as rice and wheat. (Hope to adopt)