Hollywood's Mysterious Poop Graffiti

I live in Hollywood, and walk around my neighbourhood every day. Recently, I started noticing lots of shit sprays on the walls near my apartment. I've never really seen this before, so I started to document them.

As you can see from my research, some of the shitscapes are very minimal and dry, while others are wet and messy with maggots and flies having a ball inside and around them. Some have remnants of tissue, while other deuce-droppers opted for the spray-and-run approach. In some areas, it has become such a problem that building owners have started painting over the poop-graffiti, leaving behind only shadows of their memory.

Yet, the question remains; Why?

More gross phenomena:

Gross Jar 2012

My Friend's Toe Is Falling Off

Photographic Moratorium: Period Blogging