There's an interesting story behind this photo. I don't have to credit anybody because this monkey took a selfie using a camera belonging to a photographer named David Slater. PETA then opened a lawsuit claiming that the image belongs to the monkey and not Mr Slater. The outcome was that the image is now in the public domain. Personally, I feel a bit sorry for David Slater. It was his camera and this is a once-in-a-lifetime shot. Speaking of which... I saw this photo today as well. I'm not sure who it belongs to but it is a rather striking optical illusion. You definitely have to look twice!
