Bao Bao and Ming Ming weren't that active either and I agree with Colin Tudge, who says that there should be at least two males and one female to encourage mating behaviour.
When London Zoo was threatened with closure about 20 years ago, it decided to cut the number of species held by about 33%. Keeping orangs would have led to more births and the two species of orangs could have been kept seprately. I also agree that bonobos would have made an interesting choice and it would have been very likely that the bonobos would have had had more than one baby in two decades.
This is slightly away from the main target of this thread but there are some interesting points here;
1. I absolutely agree about Gianda Pandas, a 2.1 ratio would certainly ensure more sucessful breeding as it would stimulate the males more and give the female a choice of partner. In the wild several males congregate around an oestrus female and the strongest/most persistant suitor wins her attention for mating. Unfortunately the Chinese seem to persist in loaning out just the 'matched' pairs of 1 male and 1 female, some of which later show reduced or no interest when it comes to mating. I doubt any Western Zoo dealing with the Chinese has felt confident enough to request a 2nd male with their alotted pair! Also most zoos have to build seperate 'twin' accomodation to house their pair seperately, as have Edinburgh, so an additional 2nd male animal could pose an additional expensive housing problem, although two males might live together quite happily outside breeding times?
But as far as increasing activity goes- I suspect that outside of the brief courtship and mating periods, that three adult Giant Pandas would show similar activity levels as just a pair...so the advantage of the extra one would only be for breeding purposes.
2. London Apes.
Another reason London moved the Orangutans out was because they were regarded as 'labour intensive'-the big number of animals could not all be kept together as a group, particularly the two adult males and different mothers and their young, so several were probably offshow at any given time, while for a while the Lubetkin house was also given over to them. Its hardly surprising they bred like flies as they started with nine animals gifted to them from Borneo, and even after a couple were sent elsewhere(Vienna) there were still plenty left to breed from.
But Orangutans are difficult to house well-in captivity even with good climbing facilities and masses of space, they still often lie around with the appearance-to the public-of looking lazy or bored (more so than the other Apes, though it is probably only a perception, not reality) and London only had Bornean orangutans which are much the less active species too. Visitors can be critical of the zoo if they perceive 'unhappy' looking animals and I think this factor- they made the poorest display of their three Great Ape species, was also taken into account with the others at the time they were moved.
In my opinion, the current Gorilla kingdom-if it had been designed and used for Orangutans instead of Gorillas as their major Ape species, would have been a poorer exhibit than it is- even with breeding Orangutans. Its not too exciting with the current adult Gorillas, which do very little, but the potential is still there for them to establish a proper
breeding group like most other zoos. Then its exhibit value would improve hugely. Chimpanzees or Bonobos would do equally well- the Twycross Bonobo group(s) is often very active and interesting to watch, more so than common chimps as they are quicker and more excitable creatures. They would be my 2nd choice after Gorillas, for London. But they still don't hold the same cachet for the public as an exhibit as Gorillas do, owing just simply to their much smaller size and the impressive bulk of male Gorillas.
Their Gorillas have admittedly had a catalogue of disasters, ever since the 1980's successful breeding and mother-rearing of the two female young from Zaire and Salome- had they kept these longterm with the two mothers and simply exchanged the male, giving them a group of four females to breed from, they could well have have had a thriving group by now. Moving those two young zooborn females to Belfast was a crass mistake and the start of all their problems with establishing a proper group, which still continue to this day. But potentially a Gorilla group would be/is still a bigger draw than any other Ape species and that is why they retained them, I m sure.
Its not the Gorillas that are particularly difficult or slow breeders,as many places prove, just London's outstanding failures to have a successful breeding group due to all the changes and unsuitable animals and losses, and that can still be rectified, I'm quite sure.
In terms of exhibition value/activity I would rate the Great apes in the following order;
1.Gorilla group including young.
2. Bonobo group/Common Chimpanzee group.
3 .Orangutans- and Gorillas
without young..
3. Bears. I always thought Sloth Bears were just about the poorest choice of a Bear species with which to relaunch the concept of Bears at London Zoo. They don't look like typical bears, being scruffy and shaggy with odd-looking faces, and they did not use the very large enclosure actively, as expected either. Had another more typical-looking species such as Spectacled Bear been tried, things might have gone better. Sun Bears I don't think are a particularly good choice either-easier to house and rare but people expecting 'big bears' may be disappointed by their very small size.