When @twilighter and I visited Zoo Negara, we were toured around for 5 hours by one of the curators. He told us that the Sable Antelope often just jump out of their African Savanna exhibit at night and can be found wandering near their exhibit by staff who arrive early in the morning. The antelope then simply leap back into their paddock, as the barrier is extremely low. Apparently this has been going on for a long time and the zoo never has any problems with the animals going far into the zoo's grounds.
@snowleopard That's a fascinating story and I would have never guessed that! For a long time, I've had the impression that male Sable Antelope could be very aggressive and dangerous to work around. These look like females, so maybe their more docile and tractable.