However, in areas that have already frozen, like many places in western Kansas, look for birds feeding in fields. This has gone on throughout the fall and will continue as new puddle ducks, including gadwalls and especially mallards, push in with each new front. "It sure seems like a lot of ducks are still held up north of us," agreed DU's Josh Williams. "but you're just not going to show up one day and find birds the next. It's going to take more work than that."