A keeper informed me that the reason for moving the yaks was the arrival of a new bull, appropriately named 'Voldemort,' who managed to bypass the cattle grid and, although I am not sure how, taught the rest of the herd how to do so as well! Personally, I love Passage through Asia - its size, the numbers of the herds, the rolling terrain and the gorgeous pools make it one of the most serene and picturesque drive-throughs in the country, but it lacks the awe factor of other safari parks due to it just being deer, camels and wild horses. I would love to see the yak return, but perhaps even introducing the Indian Gaur (who, as an unrelated side-note, I am delighted to finally see labelled on the map) or Indian Rhinos to the exhibit. The only issue may be that drive-throughs with such large species usually need additional monitoring (such as the tractors found at Longleat and Woburn used to chase off rhinos that stray too close to cars), which ZSL may not like the idea of. It won't exactly have the same awe as rhinos or gaur, but in terms of interesting species I would love to see the Persian Onager return! I like Passage as it is, but I do feel as though with a little improvement such as that it can become one of the UK's very best zoo exhibits, and it seems to fall somewhat short of its potential at the moment...
I have recollection of a young male Rhino being kept in the second part of the passage along with the camels etc. But this was probably 30 or so years ago!
I don’t believe the Onager were ever in the drive thru, I remember them in the current yak paddock and originally the paddock where monkey forest is now