This is the picture everyone was buzzing about. Is it real? Yes. But it is grossly disproportionate. It's a fotografia technique. The real scale of the aranha is relative to the sleeve in the foreground of the photo, not the man in the background.
A short look at a frog which has three heads. There are claims that it was found near a power plant and thus is a result of radiation, but that isnt 100% supported, it could simply be a case of nature...