This shot was taken at the San Antonio Zoo of the Komodo Dragon that is on display there. The Komodo Dragon is the largest living species of lizard in the world, with the average size being between 6 and 8 feet. The Komodo Dragon can be quite vicious and although they are very large, there have not been many cases of human attacks (however, a fisherman was killed by two Komodo Dragons in 2009 and a small child was killed by one in 2007).
It is a very interesting animal to see (and the picture really doesn't do the Komodo Dragon justice for how large it really is). I included the National Geographic website in the photo description if you would like to read more about this impressive creature!