I  drive the 1904 Cagney steam locomotive at the San Francisco Zoo.Just leaving the station,to our right is a fenced field with a Bairds Tapir and two Capybaras.Now the Tapir wants to play and chases the cap's  , so they hide right next to the fence on the train right of way. As this is the only place they then can be seen from, I announce this before each trip, and slowdown to a crawl  as each of the three passenger cars pass the two capybaras.The capybaras  lay down, sit up, eat , and in general could care less about all those visitors.I get a big kick out of introducing new people to these fascinating  animals.