The search for the orang pendek has been the focus of much interest at the CFZ. The orang pendek is frequently singled out as the cryptid most likely to be discovered next and added to the known species category. The press releases very frequently simplify the situation for the layman to more easily get the thrust of the argument. There is more than one kind of orang pendek and the name does not specifically refer to any one thing in particular.
L: "Heuvelmans Yeti Compared to Orangutan Proportions" R: BH Orang Pendek As Dwarfed Solo Man
The names orang pendek and orang utan are used in what Sanderson calls Kitchen-Malay, a sort of creole trade language, in which the word 'orang' means 'person' (i.e, a human being). 'Orang pendek' means 'short or stocky person' and 'orang utan' means 'person who lives in the forest.' Both names can and are in common usage to mean regular human beings with just such determining characteristics. The native terms 'sedapa' for orang pendek and 'mias' for orang utans are preferable, and this is the situation as stated by Ivan T. Sanderson in 1961 in his book Abominable Snowmen: Legend Come to Life.
Now because we have a situation where a creature is named by a non-specific name, we have a situation where more than one kind of creature is being reported under that name. The situation is exactly the same as in the case of the South American Didi: one of the types is a hominid with long head-hair and human-style feet with non-opposed toes. The other is a kind of an ape with non-differentiated head-hair and an opposable toe on its foot. In both the Old World and the New.
Eyewitness drawings of orang pendek
Now the ape-like pendek is clearly like an orangutan in the shape of its skull and facial profile (I am ignoring the occasional reports of an outsized Siamang also confusing the issue) And as a matter of fact, on the islands of both Sumatra and Borneo, known orangutan habitats, there are not only reports of 'little ones'; there are also reports of giants. The giants in Sumatra are known as orang gadang (great big people) and there is a very famous case of one giant orangutan being killed and sent to a museum mentioned in all the old natural history books. That one was over seven feet tall when the dead body (NOT the stretched skin) was measured. Chad Arment in Cryptozoology: Science and Speculation (2004) discusses this case.
Going by human records, it might well be possible for orangutans to range from under three feet tall to over eight feet tall as adults (male heights). It is even conceivable that the end populations might form inbreeding populations of unusually large or unusually small average sizes through the process of genetic drift.
Now it just so happens that a comparable situation is reported in the Yetis of the Himalayan region (Ivan Sanderson does at one point specify 'The Meh-Teh [classic yeti] is NOT a Himalayan inhabitant' but there is clearer evidence for them in the Everest region and around Assam) where the basic type of creature is very like an orangutan and in this area there are not only reports of the big yetis over seven feet tall, there are reports of the dwarf kind or Teh-lma. This last kind is very like the ape-like version of the orang pendek, although the tracks attributed to it are probably mistakes (on the occasion reported by Gerald Russell, the tracks were in association with a sighting, and the reported creature was much too large to have made the tracks)
So I think there is a good chance that both the large and small orangs (sedapas, or orang gugus) and the large and small 'yetis' are genetically-isolated offshoots of the known orangutans, and the parallel situation among the yetis developed by a parallel process. The yetis would be related to the orangutans, but the severe differences in foot structure and habitat make it likely they are not the same species. They may well represent the more generalizsed ancestors of the more specialised known orangutans (pongo). In his checklist Heuvelmans concludes the listing of the yeti by saying 'it is equally possible that the so-called Snowman is merely a particular form of orang-utan, more terrestrial than the tree-dwelling kind', and this entry immediately follows another entry for mainland-Asiatic orangutans (Olo-banda and Bir sindic in Assam, in English translation 'Big Monkey', equivalent to Mahalangur used around Mount Everest)
(P.S, I am NOT advocating the existence of the orang pendek in the form of two or more cryptids, i.e, unknown species. To my classification the more human type is simply a Homo sapiens sub-type while the ape-like form is an orangutan variant, and I would defer to any good genetic evidence that establishes it as a new species as opposed to an unusual population of the same species.)