Where are the Animal Rights Artists?

Being an animal rights activist, I have been searching for animal rights street artists and it seems they are few and far between. In fact, the closest thing I could find to an animal rights street artist is the street artist "Roa". Roa, a Belgian street artist, does massive black and white depictions of wild animals, often rats and crows. Many of his animals are depicted as corpses, but this seems to symbolize the transcience of city life over animal rights themes.
Other info: ROA first exhibitted in 2010 in Paris, and has sincshown his work around the world. He also aquires permission to paint all of his works on others' buildings. His paintings take up to 8 hours, so doing a quick illegal painting is not an option.
Some of Roa's work
Lenticular Street Art by Roa

I was interested in ROA's painting process, which results in paintings which look alot like drawings or prints taken right out of a sketchbook. It seems he takes a pretty traditional approach by painting directly on walls.