I'm no zoologist but could it be water droplets? Do an experiment, throw some water on the roof and see if it lands on the same spot... be aware that if wrong, you might destroy a community.

http://i1287.photobucket.com/albums/a638... the link if the one above does not work I can't figure out how to edit

[URL=http://s1287.photobucket.com/user/Lelandsmom68/media/Mobile%20Uploads/image_zps533eed51.jpg.html][IMG]http://i1287.photobucket.com/albums/a638/Lelandsmom68/Mobile%20Uploads/image_zps533eed51.jpg[/IMG][/URL] these holes are on the ground outside of my apartment. I believe they are from some animal or bug. What are they from?