You jump one of the fences and hide in one of the exhibits while the guards close the zoo. You stay hidden against the wall waiting for everyone to leave, once there all gone and night starts in earnest you try to climb the fence of the enclosure again, only to find it was a lot easier to enter an animal’s habitat then it was to leave. You try climbing the fence out again only to find it virtually impossible due to the bars being curved into the enclosure, this made it easier to get in... but a lot harder to get out.
You don’t panic though, there was probably a door for staff to enter that you could escape through if it was unlocked. You just had to look out for any animals. Speaking of which, what animals enclosure did you enter anyway?