For maximum protection against squirrels and maximum comfort for your favorite birds, try the Perky-Pet Squirrel-Be-Gone Max Bird Feeder. This feeder includes our patented Flexports, which offer 5-in-1 benefits for birds and you. The unique design is 4X more shake resistant than standard ports so there's less seed waste - which means money saved and fewer messes on the ground! The design also allows birds to feed at an optimal position outside of the port, offering better visibility so they feel safer and stick around longer. Each feeding station also features a ladder-style perch to accommodate a wide variety of bird sizes. To offer defense against squirrels, this feeder boasts multiple great features. First, this feeder's weight-activated perch system is calibrated to support the weight of birds but not squirrels. When squirrels try to gain access to the perches, the ports close off under their weight. In addition, the new and improved Sure-Lock cap prevents squirrels from lifting the lid, while the metal frame discourages chewing around the ports. To ensure a 100% squirrel proof feeder, placement is key! Squirrels are clever acrobats, so it's important to find the right hanging location. Hang the feeder with at least 18 inches of clearance on all sides so squirrels can't easily reach the ports.