I was still confused about this exhibit even after seeing your other photo. But now at this angle and the glass in the middle, I see the tortoises can never cascade down.
Sorry -- I meant between the top panel that says their name on it and the poles that elevate it (the whole semi circular structure), is there a glass window that goes all the way around so the tortoises can't slide down the poles?
You guys have it all wrong. This is clearly a roller coaster track, and Sedgwick is to be commended on beating Busch Gardens and DAK on having the world's first roller coaster tortoise viewing.