Durham Treetops Restaurant has several GF options including pre-packaged turkey sandwiches, hamburger/cheeseburger, and grilled chicken, all on a GF bun. My cheeseburger was pretty decent; bun didn't fall apart until the very last couple bites. I have Celiac and did not get sick. Staff told me when a GF order comes in for prep, gloves are changed, etc. Little to no GF options in the rest of the zoo, however.
Treetop has good access to gluten free burgers, chicken, and fresh foods. Good luck anywhere else in the zoo.
We visited the zoo recently, and I was pleasantly surprised to find that the Durham TreeTops Restaurant (to the right of member services just inside the entrance) had a good selection of gluten free options. This list includes hotdogs, hamburgers, cheeseburgers, chicken sandwiches, and turkey sandwiches on a gluten-free bun. They also had sides of fruit, apples, milk, soda, etc. It's good place to grab lunch, and the restaurant's long wall-sized window view of the jungle is pretty amazing and fun to look at while you eat.Next time you visit, be sure to ask member services for the latest updates. That's where I got this tip-off.