Der - your birds don't need fat at temps of 50 f. We've been having wind chills of minus 9 with a foot of snow over the weekend and an inch yesterday. Jim shoveled a path to the feeders as our birds are in a feeding frenzy. Six goldfinches at once on the finch feeder. with such deep snow the birds can't get to any seeds that are on the ground. We saw a little mouse peek his head out from under the snow and grab a nut. Supposed to warm up later this week. Keep well. Lorraine