We were in Secret World of the Okapi, viewing one of them indoors, when they let the other in.
A keeper was also in the public viewing area. There were only maybe 5-7 people around and he said we may (or may not) want to stay watch as they thought she might be in season today.
We stayed 5-10 minutes before we had to press on and this was as close as it got, so I can't report whether anything happened or not I'm afraid!
