I live in a semi-rural area. Several years ago, a small town nearby was having difficulty with turkey vultures roosting in a grove of trees in the center of town. Their smelly droppings were all over the sidewalk.
While the town council was trying to come up with ways of making them go away, they were considering a system that would scare the birds with loud sounds. They are protected, so nobody is allowed to harm them.
Lucky for the town, some old farmer clued them in. He told them to hang a dead vulture in the trees. Lucky for the townspeople, there was a roadkill vulture available. Problem solved. The birds left the town.
Wish I’d known that a few years ago. A “committee” of vultures took over the playground at the daycare center where my daughter worked. There had to be at least 45-50 of them hanging out. They couldn’t let the kids play outside because of all the droppings and some of the birds were aggressive. They tried playing loud music, balloons with giant eyeball markings, but the dang things just hung around; if an adult came outside, they might flap off a few yards away but they weren’t scared at all. After a couple of weeks they left, en masse, and everything was scrubbed down so the kids could play outside again. Weird!