Alligator. Chewier than chicken. Tasted kinda like chicken. Would try again, I guess.
Also had ostrich burgers a couple of times. I'm told I was shitfaced and enjoyed them immensely, but I couldn't tell you for sure, for I was shitfaced.
Ostrich burgers are excellent. There used to be a sports store near here that served burgers (bison, elk, ostrich) and the ostrich was the best. Also deep fried alligator nuggets, but honestly once you bread and deep fry something they're pretty much all the same.