Performing surgery can be a complicated process - but when it's a gorilla with an infected bowel or a grumpy lion that needs a (big) CAT scan - it can get a whole lot trickier.
Take a look at the photos we've put together of creatures great and small on the operating table.
A python weighing ten stone has undergone a pioneering CAT scan for her lung problems.
Hanna, who is nearly 20 feet long, had to be folded up to fit in the machine at Columbus Zoo and Aquarium, Ohio. She underwent the scan after suffering respiratory problems.
Grahm S. Jones/Caters News