If I hadn't stolen this from a reliable site and Reuters wasn't in the credits, I would've bet money this was a Photoshop job. Here's what the caption said:
"A crocodile at a zoo in the southern Taiwan city of Kaohsiung holds the forearm of a zoo veterinarian in between its teeth, April 11, 2007. The crocodile bit off the arm of the zoo veterinarian treating it, an official reported. REUTERS/Frank Lin (TAIWAN)"
UPDATE: Here's a link to the story on Fox News. I HATE Fox News, but in this case they have the best link to more photos that are totally gruesome. And, therefore, fascinating. Enjoy!