By increasing the food supply, bird feeders encourage the rapid growth of animal populations. The technical term for this is called, increasing the carrying capacity of the land. With higher populations, animals will eventually seek to enter your home for shelter. Bird Feeders nourish wildlife in one of two ways. The first way is by foraging.
Food falls to the ground below the feeder allowing a wide variety of animals to eat.
The second way is by direct access. This method is the familiar method with squirrels who are purported to always find a way to the feeder. Reducing Foraging Don't buy mixed bird seed. Birds like Blue Jays prefer sunflower seeds. They will dump seed onto the ground seed until they find the next sunflower kernel.