For the past 2 months, we have noticed that there're suddenly no birds or sometimes very few in our yard. We usually have chickadees, titmice, wrens, woodpeckers, bluejays, cardinals, goldfinches and other wild birds. Some of them migrate and some of them will stay for the winter, they never completely disappear for this long in the past 8 years since the feeders were set up. We're in Ashby Massachusetts, Is this something that's been reported elsewhere?