Some 300 vomiting, defecating vultures have made a United States Customs and Border Protection radio tower in South Texas their home, coating the tower and buildings beneath it with potentially hazardous excrement as besieged border officials try to stem the deteriorating situation.

In a notice on Thursday, the agency said it was looking for advice on how to attach some sort of net on the 320-foot tower in Kingsville to keep the vultures from roosting and nesting on its “railings, catwalks, supports, and on rails and conduit throughout.”

“Droppings mixed with urine are on all of these surfaces and throughout the interior of the tower where workers are in contact with it, as well as on areas below,” the agency said. “Since the presence of birds attract more birds, this rural tower will be a frequent and constant target for vultures.”

The agency said it hoped to have the net system, which would cut off access for the birds, in place by August, “before the natural heavy vulture roosting period during the fall months.”