My sister gave me this brochure for the zoo next to where she lives in Utah, and it's AWESOME!! Check out these illustrations! She also said that all the signage inside the zoo and leading up to it have these kind of illustrations on it.
It doesn't say who the illustrator is, so if anyone knows, let me know! It kind of reminds me of Dan Krall, but who knows...
This guy's the "Ghost of the Bayou" and it's a real white alligator that they have at the zoo!
EDIT: I found some more high-res images of similar posters. CLICK HERE