Squirrels, raccoons and other climbing critters can't gain any headway when they try to climb over a Squirrel Slinky. Use for pole mounted bird feeders. Fitted with a high tensile spring, when weight is put on it, the Squirrel Slinky lowers to the ground. As the critters move their weight from the Squirrel Slinky to the pole above, the rod rises and pushes their paws off.