This bird feeder features two squirrel-resistant features. The roof is on a hinge, it tilts with the weight of a squirrel and closes both ports. The second feature is the two metal perches are spring-loaded to close both ports from the weight of a squirrel, 4lb capacity. The feeder has a wide opening under the roof for easy filling. The Brown Squirrel Resistant Bird Feeder measures 7.87" L x 10.75" W x 11.30" H.