gang art

these birds are all over l.a. right now. does anyone know what they are? it's usually a p.r. stunt. we had a graphic artist, here in the beach cities,
do this with his 'hippy trees' to, sort of, brand his image.
i remember reading somewhere that gangs will often throw tennis shoes up on to a wire to signify territory. (ok, if you're a gang member, reading this, and i have it all wrong, please don't laugh at me. i'm a suburban white girl. what would i know about the g-man--i just report what i read.....G)
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thanks for helping me out martha!