It is hard to guess what a East Javan langur weights. But we have the answer:
An adult East Javan langur (Trachypithecus auratus) on average weights 9.72 kg (21.43 lbs).
The East Javan langur is from the family Cercopithecidae (genus: Trachypithecus). When reaching adult age, they grow up to 30 cm (1′ 0″).
As a reference: An average human weights in at 62 kg (137 lbs) and reaches an average size of 1.65m (5′ 5″). Humans spend 280 days (40 weeks) in the womb of their mother and reach around 75 years of age.
The East Javan langur (Trachypithecus auratus), also known as the ebony lutung, Javan langur or Javan lutung, is an Old World monkey from the Colobinae subfamily. It is most commonly glossy black with a brownish tinge to its legs, sides, and “sideburns”. It is found on and endemic to the island of Java, as well as on several of the surrounding Indonesian islands. The Latin word auratus in its scientific name means “golden”, and refers to a less common color variant. Note that the common name golden langur is used for a different species.Like all langurs, this species’ tail is noticeably long, measuring up to 98 cm in length while the body is only around 55 cm long. The two subspecies of this lutung are fairly similar in appearance and are geographically separated; males and females are both usually glossy black, although the females pale, yellowish white patch around the pubic area. Juveniles of both subspecies are orange in color. The nominate subspecies Trachypithecus auratus auratus has a rare morph that does not lose its juvenile coloration when it matures, instead the coloration darkens slightly, with yellow tinges on its sides, limbs, and around its ears, and a black tinge on its back.The East Javan langur inhabits the interior and peripheral areas of rainforests.This primate is diurnal and arboreal. Its diet is primarily herbivorous, eating leaves, fruit, flowers, and flower buds, although it also eats insect larvae. As with other colobines, it has evolved a specialised stomach to digest plant material more efficiently. This species also has enlarged salivary glands to assist it in breaking down food.Like other langurs, the East Javan langur is a social animal, living in groups of around seven individuals, with one or two adult males in the group. Although they will look after offspring of other mothers as well as their own, adult females are aggressive towards females from other groups. The brighter coloring of juveniles may alert females to their presence and ensures that they will always be noticed and protected. This species has no discernible mating season and females produce one offspring at a time.
Animals of the same family as a East Javan langur
We found other animals of the Cercopithecidae family:
- Black-footed gray langur bringing 10.03 kilos (22.11 lbs) to the scale
- Stump-tailed macaque bringing 9.38 kilos (20.68 lbs) to the scale
- Capped langur bringing 11.21 kilos (24.71 lbs) to the scale
- Maroon leaf monkey bringing 6.37 kilos (14.04 lbs) to the scale
- Barbary macaque bringing 11.49 kilos (25.33 lbs) to the scale
- Red-tailed monkey bringing 3.54 kilos (7.8 lbs) to the scale
- Crab-eating macaque bringing 4.58 kilos (10.1 lbs) to the scale
- Olive baboon bringing 17.73 kilos (39.09 lbs) to the scale
- Purple-faced langur bringing 7.53 kilos (16.6 lbs) to the scale
- Raffles’ banded langur bringing 7.02 kilos (15.48 lbs) to the scale
Animals with the same weight as a East Javan langur
As a comparison, here are some other animals that weight as much as the Trachypithecus auratus:
- Black snub-nosed monkey with a weight of 11 kilos (24.25 lbs)
- Tasmanian devil with a weight of 8.2 kilos (18.08 lbs)
- Lowland paca with a weight of 8.18 kilos (18.03 lbs)
- Tonkin snub-nosed monkey with a weight of 9.12 kilos (20.11 lbs)
- Pygathrix bieti with a weight of 11 kilos (24.25 lbs)
- Pudú with a weight of 9.61 kilos (21.19 lbs)
- Beira (antelope) with a weight of 10.91 kilos (24.05 lbs)
- Short-eared dog with a weight of 8.36 kilos (18.43 lbs)
- Mountain paca with a weight of 9 kilos (19.84 lbs)
- Western red colobus with a weight of 8.43 kilos (18.58 lbs)