The last post was about zookeeper romance... the other side of the coin from love is, of course, sex... of which there is often a lot of going on at the zoo (usually not with the keepers, though).
Animals don't share human inhibitions about mating in public (that being said, neither do some guests I've encountered), which can lead to some awkward moments. Usually just a lot of laughing, sometimes an effort to explain it away for the kids ("They're playing"). I've occasionally had irate chaperones or parents demand that I make the animals stop breeding because they're worried about the impact it might have on younger visitors ("Won't someone please think of the children?"). Enjoy!