Although they do offer gluten-free options the lady at the register was unbelievably rude when I asked for a gluten free burger and proceeded to order me a regular burger. My mother on the other hand went to a different station and ordered and it came out gluten free with no cross contamination issues so we had swapped. Be careful when ordering here!
Both restaurants at the zoo have gluten free options. The restaurant in back servers burgers and sandwiches on gluten free buns. The restaurant towards the front (Slice) has Gluten Free Cauliflower crust pizzas.