Squirrels and larger birds can be real nuisances: taking over bird feeders, eating the food and driving smaller birds away. This 1 quart bird feeder is the most effective overall solution we’ve ever seen for this problem. The clever innovation lies in the pair of movable perches, which will only support birds up to a certain weight. When squirrels or any large birds try to join in, the perch slides down and the opening to the food closes, shutting the intruders out completely. Winters can be tough for some birds when searching for food--this feeder gives them a better chance, and allows you to enjoy that special connection to nature. Your birds will be very happy, and so will you.