Twist Top: The Twist Lock Top keeps seed dry and away from squirrels. These feeders give birds plenty of room to live and eat. Easy to fill and clean: It is easy to fill, clean and use. This bird feeder will appeal to all birds. Waterproof: This waterproof bird feeder can achieve balanced feeding in six directions. Wide domed top to keep birds and seeds dry while they feed, features a swing-out opening in the top for easy food addition.