Sketchbook: Alligator Snapping Turtle Skull.

While perusing various skulls at the Museum of Natural History's Skulls exhibit, I encountered some where I quizzically wondered what animal it was.  Others left absolutely no doubt....

Alligator Snapping Turtle Skull (Watercolor in Moleskine sketchbook, 5x4").

[UPDATE: 12/23/2011] As with most of my work, I tend to tinker with it after it's been posted.  I made some of the values darker using pen and a watercolor wash.  I also added the gray surface with acrylic.