What an excellent article! Thank you for that! In years past I would feed birds (cardinals mostly) through the winter months. I was told that once I start feeding them I must not forget because there are birds that will not migrate south if they have a food source up here. When I took that task on I kept it up through the winter even though it was quite cold going out to that feeder in the snow. I surely don't want to create problems for my two little deer friends so I will leave them alone as hubby said. Thanks again!