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Some time ago, I talked with Автор about Borneo and I learned that there wasn’t many species described for this area. Then I proposed the lembu, a large descendant of the goat. The description of this species was approved.
Since then, I had ideas for other animals living here and decided to create this thread. We could discuss ideas for this island here and if someone else have suggestions of creatures to Borneo, they can post here too.
I'll start with a carnivore and a herbivore:

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Borneo wild dog (Canis borneensis)
Order: Carnivora
Family: Canidae
Habitat: Forests of Borneo
A descendant of the domestic dog (Canis domesticus), the Borneo wild dog forms clans, rather than packs, to attack large preys.
The Borneo wild dog is similar to the modern gray wolf but is distinguished by its smaller size, lighter weight, more elongated torso, less-prominent forehead, shorter legs and a muzzle that is narrower and more pointed. An adult female have 46 cm of length, while the slightly larger male have 54 cm. Their fur is reddish-brown. The throat, chest, flanks, and belly and the upper parts of the limbs are less brightly colored, and are more dark brown in tone. The lower parts of the limbs are black. The muzzle and forehead are greyish-brown. The tail is very fluffy, and is mainly of a reddish-brown color, with a black tip.
Bornean wild dogs’ clans frequently break into small packs of 3–5 animals, particularly during the spring season, this way they can disperse to catch more young herbivores. The dominant dogs do not engage in dominance displays as modern wolves, though other clan members will show submissive behaviour toward them. Fights between members of the same group are rare. Their clans can have 6-30 individuals and urinate to mark their territory and travel routes. This canid digs simple dens and avoids killing prey close to them.
Bornean wild dogs are primarily diurnal hunters, hunting in the early hours of the morning. They rarely hunt nocturnally, except on moonlit nights, indicating they greatly rely on sight when hunting. Although not a much fast animal, they can chase their prey for many hours. During a pursuit, one or more dog may take over chasing their prey, while the rest of the pack keeps up at a steadier pace behind, taking over once the other group tires. Most chases are short, lasting only 500 m. The Bornean wild dog frequently drives their prey into water bodies, where the targeted animal's movements are hindered.
The dominant pair is generally monogamous, they usually remain together for life. The gestation period lasts 59 to 63 days, with litter sizes averaging 4–6 pups. Pups are suckled for at least one month. During this time, the pack feeds the mother at the den site. Once weaning begins, the adults of the clan will regurgitate food for the pups until they are old enough to join in hunting. They remain at the den site 70–80 days. By the age of six months, pups accompany the adults on hunts, and will assist in killing large prey by the age of eight months. Maximum longevity is of 16 years.

Elegant deer (Gracilicervus insularis)
Order: Artiodactyla
Family: Cervidae
Habitat: Forests of Borneo
A descendant of the barking deer (Muntjac), the Elegant deer have this name because of their elegant build. They have a slim body and long neck and legs and lives in the forests of Borneo.
The elegant deer coat is golden tan on the dorsal side and white on the ventral side of the body, the limbs are dark brown to reddish brown, and the face is dark brown. The fawn is spotted. Like their ancestors, the males of the species have tusk-like upper canine teeth. Their typical head-and-body length is about 103 to 115 cm. They stand up to about 70 to 80 cm. The male also have two-tined antlers.
This species is an omnivore, eating grass, fruits, shoots, seeds, and birds' eggs, as well as small invertebrates. It can reach higher branches and twigs by standing erect on its hindlegs and elongating its neck; this helps it reach over for leaves and fruits. When in danger, it will do an alert sound similar to the barking sound of their ancestors.
The elegant deer forms harems, comprising a dominant male, three adult females and their offspring of the previous and the present year, the young males form “bachelor herds” until they reach maturity. The gestation period is seven to eight months and they usually bear one offspring at a time, but sometimes produce twins. Females usually give birth in dense growth so that they are hidden from the rest of the herd and predators. Weaning is completed at around 7 months and at around 12 months the fawn is independent, the young males are banished from its mother herd after one year. Adult males often fight between one another for possession of a harem of females, using their antlers or their tusk-like upper canine teeth. Elegant deer show no evidence of a specific breeding season within the species. Reaching sexual maturity with 3 years, the elegant deer have a lifespan of 17 to 20 years.