I am currently about halfway through the book "Kingdom Under Glass" (2010), which is a biography of the famous taxidermist Carl Akeley. The man who helped stuff Jumbo and also create the legendary African Hall at the American Museum of Natural History would be horrified to see a photo such as the one above.
Here's the link to the entertaining and informative book:
[ame=http://www.amazon.com/Kingdom-Under-Glass-Obsession-Adventure/dp/080509282X/ref=la_B001KIQFDM_1_1?s=books&ie=UTF8&qid=1401512950&sr=1-1]Kingdom Under Glass: A Tale of Obsession, Adventure, and One Man's Quest to Preserve the World's Great Animals: Jay Kirk: 9780805092820: Amazon.com: Books[/ame]
My least favourite comment to hear from zoo visitors is their complaining that animals look 'sad'; however, in this case, those complaints would be valid. Giant otters normally appear to have a real joie de vivre; this poor fellow looks like he's just been told that his parents have both run away to join the circus.