Bluebirds love it. Squirrels hate it. Meet the Pacific Bird & Supply Co Inc Galvanized Mealworm Feeder, a mealworm feeder that attracts bluebirds along with wrens and warblers. Metal construction withstands heat and humidity better than plastic, and the smart roof design actually keeps your mealworms dry. Insectivorous birds can't stay away! An easy twist-lock system holds the roof on and allows you to easily remove it for filling. Galvanized steel won't rust!