Raven in the Old Botanical Garden, Munchen (Munich), Bayern, Germany, 2010

This bird doesn't look big enough to be a raven, but I'm leaning in the direction of saying that it is because of the beak, which is actually hard to see in this photo. The photo also creates the illusion, for whatever reason, that this bird was short and chubby, which wasn't actually the case. Can anybody identify the species for certain?