One theory:
War in Aceh. It ended only a few years ago (after the 2004 tsunami).
Sumatran orangs live only in the north of Sumatra (and there only in lowland forests).
Do Borneans really receive more attention? What are you basing this on?
In terms of the fact of attention from what I have seen in the UK Zoos seem to focus education and outreach projects on both despite the Borneans being more common in zoos that Sumatrans.
Its only in the UK that Borneans outnumber Sumatrans so heavily- with only Chester and Jersey keeping & breeding Sumatrans nowadays- though Monkeyworld have also recently got one small male from a zoo in Spain.
Elsewhere- in the USA and Europe, the two species are roughly equal in numbers in the Zoo populations.
I am just basing it on how I perceive it. To me, there seems to be more funds and conservation projects aimed at saving Orangutans in Borneo (Sabah, Kalimantan, etc.) than the ones in Sumatra. Sumatran Orangutans are much more isolated and endangered than the ones on Borneo and it just seems a little surprising that there is such a huge population difference between the Orangs on Borneo compared to the ones on Sumatra (25,000 on Borneo as opposed to 7,000 on Sumatra). It's just simply the way that I perceive it.
I'm just curious. Borneo has, what, 25,000 Orangutans and Sumatra has only 7,000. Seems kind of strange to me. Anyone have any theories?
Because the rate of destruction of the Sumatran rainforests is much faster than rainforests in Borneo. Much of the heart of Borneo is still intact forests whereas Sumatra's remaining forests are fragmented.