This feeder has at the base a unique access port in the base that allows the feeder to be filled with ease. It is advisable to fill the feeder over a container such as a box or bucket so that - in the event of spillage - food can be easily retrieved. The secondary metal cage is designed to keep Squirrels and larger birds such as Doves & Pigeons from the Seed. Easy to fill & maintain and will provide hours of enjoyment as you watch the birds feed.