Well it is a reference to zoo immersion as a whole, DAK really pioneered the concept to the standard and degree that we have in many zoos today, even though other zoos had already done excellent jobs in immersion. The Bronx Zoo as an example when it debuted their African Plains exhibit 79 years ago, debuted the concept of having panoramic vistas encompassing several exhibits. Visitors back then actually thought that the lions were given a free pass on all the other animals lol. The New York times actually did an article about it. But you are right on the money about the example being that of Bioparc Valencia, SPOT ON, it is my design at the end of the day

and I'm very proud of it. The amazing thing about this game is that having no budgetary constraints or boards to shut your ambitious ideas down, the sky is the limit.
Your example of the elephant grass is great, another natural barrier that can be use in the game, but not what he/she was asking. The question is can an animal cross over to another exhibit and not be designated as an escapee. Sandbox should have an option to disable escapes should the player choose it or want it. I'm perfectly capable of determining what constitutes an escape within my own zoo design, having an AI tell me is just not ideal, it handicaps creativity.