It is hard to guess what a Siamang weights. But we have the answer:
An adult Siamang (Symphalangus syndactylus) on average weights 10.84 kg (23.9 lbs).
The Siamang is from the family Hylobatidae (genus: Symphalangus). It is usually born with about 517 grams (1.14 lbs). They can live for up to 38 years. When reaching adult age, they grow up to 82.4 cm (2′ 9″). Usually, Siamangs have 1 babies per litter.
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 siamang (Symphalangus syndactylus) is an arboreal black-furred gibbon native to the forests of Indonesia, Malaysia and Thailand. The largest of the gibbons, the siamang can be twice the size of other gibbons, reaching 1 m in height, and weighing up to 14 kg. The siamang is the only species in the genus Symphalangus.Two features distinguish the siamang from other gibbons. The first is that two digits on each foot—the second and third toes—are partially joined by a membrane—hence the name “syndactylus”, from the Ancient Greek sun-, “united” + daktulos, “finger”. The second is the large gular sac (found in both males and females of the species), which is a throat pouch which can be inflated to the size of the siamang’s head, allowing it to make loud, resonating calls or songs.Two subspecies of the siamang may exist. If so, they are the nominate Sumatran siamang (S. s. syndactylus) and the Malaysian siamang (S. s. continentis, in peninsular Malaysia). Otherwise, the Malaysian individuals are only a population. The siamang occurs sympatrically with other gibbons; its two ranges are entirely within the combined ranges of the agile gibbon and the lar gibbon.The siamang can live to around 40 years in captivity.While the illegal pet trade takes a toll on wild populations, the principal threat to the siamang is habitat loss in both Indonesia and Malaysia. The palm oil production industry is clearing large swaths of forest, reducing the habitat of the siamang, along with that of other species, such as the Sumatran tiger.
Animals of the same family as a Siamang
We found other animals of the Hylobatidae family:
- Northern white-cheeked gibbon bringing 7.32 kilos (16.14 lbs) to the scale
- Müeller’s gibbon bringing 5.92 kilos (13.05 lbs) to the scale
- Siamang bringing 10.9 kilos (24.03 lbs) to the scale
- Hoolock gibbon bringing 6.7 kilos (14.77 lbs) to the scale
- Northern white-cheeked gibbon bringing 7.32 kilos (16.14 lbs) to the scale
- Kloss’s gibbon bringing 5.84 kilos (12.87 lbs) to the scale
- Lar gibbon bringing 5.6 kilos (12.35 lbs) to the scale
- Agile gibbon bringing 5.85 kilos (12.9 lbs) to the scale
- Black crested gibbon bringing 6.43 kilos (14.18 lbs) to the scale
- Pileated gibbon bringing 5.57 kilos (12.28 lbs) to the scale
Animals with the same weight as a Siamang
As a comparison, here are some other animals that weight as much as the Symphalangus syndactylus:
- Nilgiri langur with a weight of 10.6 kilos (23.37 lbs)
- Pennant’s colobus with a weight of 10.9 kilos (24.03 lbs)
- Preuss’s red colobus with a weight of 8.91 kilos (19.64 lbs)
- Tibetan macaque with a weight of 10.6 kilos (23.37 lbs)
- Black snub-nosed monkey with a weight of 11 kilos (24.25 lbs)
- Southern muriqui with a weight of 10.57 kilos (23.3 lbs)
- Capped langur with a weight of 11.21 kilos (24.71 lbs)
- Preuss’s red colobus with a weight of 8.87 kilos (19.55 lbs)
- Tonkin snub-nosed monkey with a weight of 9.09 kilos (20.04 lbs)
- Canada lynx with a weight of 9.73 kilos (21.45 lbs)
Animals with the same size as a Siamang
Not that size really matters, but it makes things comparable. So here are a couple of animals that are as big as Siamang:
- Chimpanzee with a size of 79.6 cm (2′ 8″)
- North American porcupine with a size of 83.7 cm (2′ 9″)
- Grizzled tree-kangaroo with a size of 71.7 cm (2′ 5″)
- Fisher (animal) with a size of 75.1 cm (2′ 6″)
- Japanese macaque with a size of 82.7 cm (2′ 9″)
- Red-fronted gazelle with a size of 88.5 cm (2′ 11″)
- Honey badger with a size of 68.4 cm (2′ 3″)
- Bonobo with a size of 75.3 cm (2′ 6″)
- Black musk deer with a size of 90 cm (3′ 0″)
- Golden jackal with a size of 83 cm (2′ 9″)
Animals with the same litter size as a Siamang
Here is a list of animals that have the same number of babies per litter (1) as a Siamang:
- Pudú
- Hoffmanns’s titi
- Egyptian free-tailed bat
- Mountain paca
- Red-tailed squirrel
- Madagascan rousette
- Cape serotine
- Rafinesque’s big-eared bat
- Angolan talapoin
- Chimpanzee
Animals with the same life expectancy as a Siamang
Completely different animals, but becoming as old as a Siamang:
- European wildcat with an average maximal age of 31 years
- Common genet with an average maximal age of 34 years
- Onager with an average maximal age of 38.75 years
- Southern pig-tailed macaque with an average maximal age of 34.25 years
- Asian black bear with an average maximal age of 35.17 years
- Toque macaque with an average maximal age of 35 years
- Ribbon seal with an average maximal age of 31 years
- Okapi with an average maximal age of 33 years
- Northern giraffe with an average maximal age of 36.25 years
- Bearded seal with an average maximal age of 31.42 years