People love to feed birds. It’s a great way to bring wild animals right into your backyard, and it’s a big industry, too, with more than $3 billion dollars spent annually on birdseed alone. There are hopper feeders, suet feeders, hummingbird feeders, and many more. There’s even a market dedicated to keeping squirrels out of the feeders, with products for sale like the Squirrel Be Gone and Squirrel Buster Plus. As popular as bird feeding is, few people think about negative impacts that the feeding could have on the birds.