i doubt is it because of coyotes. we have a bunch of them here in ohio and our birds gobble alot. turkeys will shock gobble at a coyote howl so i seriously doubt that is the "problem". i have seen them shock gobble at less than 100 yds from a howl. have seen coyotes enter a field with birds in it and the birds just move off and keep a safe distance and then return to normal after the yote has passed. if yotes caused birds to not gobble i doubt anyone in any state would hear very many