The latest high for cardinals is 17 males at once. That is a plastic quart container on the platform feeder. Larry puts a quart of sunflower seeds out at a time. When there's a lot of food available, he still feeds them once a day. When there's snow and ice out, he feeds them several times a day. When we are gone and I pay somebody to water my porch flowers, I also get them to put water in the birdbath, seeds on the feeder, and hummingbird food in the hanging feeders. They are entertaining to watch, but I wouldn't feed them like he does. He also puts shelled corn out for the doves.