Large flock in tree. (1 Viewer)

Hi everyone:

I am posting this trying to help out my church. We have a large (approx 15' high) ornamental tree out by the main walking area that a large flock of what I want to call "common black birds" flocking and congregating in. There are quite a few of them that hang out in there, at least 100 and their droppings end up all over the sidewalk below. We would like to find a humane, efficient way to repel them from the tree. I have looked up several different devices but would like to get the advice/thoughts of some of you on here before we start going and spending money on nets, high pitched noise, flashing or water spraying devices. Any ideas or suggestions would be greatly appreciated. Thanks!!

What are "common black birds"? Common/European Starlings?

Charles, if you can get a picture we can probably ID the birds. It might help in coming up with a solution.

Flock of 100 birds pooping all over the sidewalk? Gotta be starlings.