I'm sitting in the Denver airport and there are entire flocks of little birds flying about. It makes me wonder how they got here?
Is it a random process where birds accidentally fly in through open doors?
Are there simply holes in the airport big enough for them to fly in and out?
Are the birds organized enough to stage daring raids swooping through the air handlers until they get inside?
In a very science fiction way, I hope it's the last option.