What was done to prevent or remove wildlife such as alligators and birds from the runway at Kennedy Space Center, so the Shuttle could land safely?
For birds, NASA deployed its heavy weaponry - propane cannons.
A series of 25 liquid propane cannons, placed in strategic locations along the east and west sides of the SLF runway, are controlled by air traffic controllers in the tower and remotely by bird-watchers in the field. These cannons, installed in September 2007, are fired randomly by zone, individually or all at once. Each rotates in a 360-degree pattern for the greatest effect.
SLF = Shuttle Landing Facility
More intractable avians got a personal visit. The gun was - reportedly - only used to scare them.
Smith fires shotguns and pistols loaded with blanks to scare large flocks of birds away from the runway. From time to time, he sounds a special siren from his truck or uses a remote control to set off cannons.
For mobile speed bumps such as alligators, my memory says a walkdown was done of the runway prior to landing. I can't find a reference for that, however, except for this rather vague statement:
Prior to each Kennedy Shuttle landing, it is the task of a special crew to clear the runway of all debris, including any alligators that might be sunning themselves on the runway surface.
The SLF logo proudly featured a gator!