Which high-quality seed mix component is frequently consumed by ground-feeding White-crowned Sparrows, often appreciated alongside cracked corn in winter?

Millet (White proso millet)

When provisioning White-crowned Sparrows, especially during migration or winter when seeds are paramount, certain high-quality mixes are known attractants. Among these, White Proso Millet is specifically noted as frequently consumed by these ground-feeding sparrows. Millet is often preferred because its small size makes it easily manageable for birds that forage on the ground or pick up scattered fragments. This preference, along with cracked corn (particularly valued during harsh winter conditions) and fragments of Black Oil Sunflower Seed, forms the core of an effective feeding strategy aimed at attracting these birds to a yard setup that mimics their natural foraging substrate.