Passerine birds, particularly nuthatches, siskins, titmice, goldfinches, wrens, and cardinals are quite fond of seeds, and eat them purposefully, when they can find them, as a source of nutrients. Seeds are high in proteins and fats, which birds need to have healthy oil glands. In the winter, birds use the oil from their glands to spread on their feathers and keep warm. In my bird feeder, the birds seem to like black oil sunflower seeds the best.
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