A clean feeder is a life-and-death matter to some birds. To protect the birds at your feeder, clean it at least once a week, more often if necessary. Rake the ground underneath, too. Pine Siskins are especially prone to salmonellosis, a bacterial disease. You can learn more about feeding backyard birds at Cornell's AllAboutBirds. California Partners in Flight has more suggestions about feeding birds safely!

More info and transcript at BirdNote.org. 

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