All the little dark spots in this picture are juncos feeding on the ground and in the tray feeder. The bright yellow objects are partially eaten corn cobs which are enjoyed by bunnies, bluejays, grackles, and crows. I have a friend who still picks corn on the ear and he sells me 50 lb. bags of ear corn for cheap. Once the deer start coming back, they will start eating this ear corn also.
They're one of our most common winter birds in Minnesota. We should be seeing them for several more weeks before they depart for their summer migration to nesting grounds in Canada and Alaska. I'll miss them when they're gone, but then I'll have the spring and summer birds as consolation.
Gotta' love them "snowbirds!"