These are bats. Somewhere between 3 to 5 hundred. This accounts for about 5 percent of the total amount in the building in question. I have to wear a respirator when I'm around them because the large amount of fecal matter contains to airborne pathogens that would likely put me in the hospital at the very least. There was still enough urine and feces to make my eyes burn 4 hours after the fact. Also I got to kick in a door to get in the room pictured above, cross that off the bucket list.
Bat Fact: Bats account for the majority of cases of rabies in the first world countries some say as much as 90%. The guys i was working with called me Batman while on this job, I could take offense that they didn't know my name, but I choose to believe they saw the potential of superherodom in me.