What a fantastic photo. I can't believe I haven't been to this zoo yet, since I know from all the photos it would instantly become one of my all time favorites.
Oklahoma Trails is an excellent 8-acre zone with over 800 animals (including every little critter), Cat Forest has 9 feline species spread out over 4 acres, Great EscApe is above average, Wild Dog Drive is fantastic, and there are many large hoofstock yards spread throughout the zoo. The North American collection was ranked as #2 by the authors of "America's Best Zoos", and overall I personally regard this zoo as a top 10 contender in the United States.