Droll Yankee FeedersYankee Dipper: Prevent large birds and squirrels from eating all your bird food! You save money on seed when you use a Yankee Dipper Bird Feeder. The Yankee Dippers weight sensitive perches encourage smaller songbirds to eat, while preventing all squirrels from feeding Each perch is individually sprung and calibrated to collapse when approximately 2 oz. or more rests on the perch The heavy metal cap fits snugly on the tube to prevent squirrels from