Until 12 days ago contents of bird feeders eaten in 24 - 36 hours. Since then great reduction in number of birds visiting garden. Seed feeder still has contents after 12 days, fat balls usually eaten 5 - 6 days container after 12 days 2/3 full. Buzzards in vicinity for several years. One now spending time within 100 yards of property. on Friday enjoyed its prey just below bird feeder but that is nature.