Its been extremely cold here and my birds willl go outdoors, but come right back in. They haven't been eating much at all and I'm afraid they'll loose weight during this cold snap. We have tried some "treats" but they don't even want that. Their food is scattered all around their bowl. The ducks love earthworms, but the bait stores don't carry them in the winter there is no way to dig for them in this weather. Also, the ducks (Indian Runners) will stand on one foot and put the other one under their wing. This makes be believe they really are cold. Mostly, I want to know when to worry about their lack of interest in food. They seem fine and alert, so far.