The Leto spring feeder in Silver is designed to deter larger bird feeding. Each port operates independently allowing birds up to a maximum weight of 70g to feed safely whilst keeping away larger birds and it deters squirrels too! How it works: As a larger bird lands on the port and exceeds the weight limit of the perch it will lower, as it slides down the port becomes covered preventing access to the food. The dividers between each port prevent the larger bird from hanging on and feeding from the adjacent port. Only the port that has exceeded the weight will close allowing other birds to continue feeding. Ideal for keeping away: Adult doves, magpies crows, jays, woodpigeons, jackdaws and squirrels