Gamgee's Garden Acrylic Window Bird Feeder with Removable Sliding Tray and Suction Cups The roof makes the feeder virtually squirrel proof and protects the birds and seed from wind and rain. Birds eat comfortably from the sturdy lucite perch. Provides endless hours of entertainment for pets, who will sit watching the birdfeeder with rapt attention. Makes an excellent gift. Removable tray is easy to clean and refill. Drain holes keep water from pooling in the birdseed so it stays fresh far longer. Heavy-duty suction cups adhere strongly and easily to any smooth surface. Effortless installation in a matter of seconds. Thick, 3mm acrylic plexiglass is durable and capable of withstanding the elements. 100% Satisfaction guaranteed.