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Lar gibbon

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The lar gibbon, scientifically known as Hylobates lar, is an endangered primate within the Hylobatidae family.

White-handed Gibbon
White-handed Gibbon

Often called the white-handed gibbon, this ape is a vital part of Southeast Asian ecosystems. It is widely recognized due to its presence in both wild habitats and captivity. Because it is endangered, the survival of this species is a major concern for scientists. These primates play a significant role in the health of the tropical rain forests they inhabit.

Movement is central to the life of a lar gibbon. They are true brachiators, which means they move by swinging under branches using only their arms.

To support this, they possess extremely long arms and relatively short legs. Their fingers are curved to provide a strong grip on wood. They also have an intermembral index of 129.7, which is one of the highest among primates. This measurement reflects the ratio of their limb lengths. Additionally, they have ischial callosities, which are tough, bony sitting pads on their buttocks.

There are five recognized subspecies of the lar gibbon. These include the Malaysian lar gibbon (H. l. lar) and Carpenter's lar gibbon (H. l. carpenteri). Other types are the Central lar gibbon (H. l. entelloides) and the Sumatran lar gibbon (H. l. vestitus). The fifth is the Yunnan lar gibbon (H. l. yunnanensis), though it is possibly extinct. These subspecies are often separated by large rivers, a biological pattern known as allopatry. This geographic separation helps define the different groups within the genus.

Historically, the lar gibbon had a very wide range. It stretched from southwest China down through the Malay Peninsula. Today, they are found in Indonesia, Laos, Malaysia, Myanmar, and Thailand.

Flickr - Shinrya - Tokyo Zoo
Flickr - Shinrya - Tokyo Zoo

In Thailand, populations may number between 15,000 and 20,000. However, in China, they may be nearly gone, with perhaps only 10 left. Their habitat includes various dipterocarp forests and seasonal evergreen forests. They generally stay in lowland areas and do not live far above sea level.

Dietary habits for the lar gibbon are quite diverse. They are considered frugivorous, meaning fruit makes up 50% of their diet.

Someone a carrot?? (4032566062)
Someone a carrot?? (4032566062)

Leaves account for 29%, while insects make up 13% and flowers make up 9%. They eat figs, berries, young shoots, and even birds' eggs. Interestingly, their insect consumption can increase twenty-fold during the summer months. Their teeth are specially adapted for this variety. They have large, dagger-like canines in both the upper and lower jaws. Their molars have low, rounded cusps and thick enamel to help process food.

Socially, lar gibbons are diurnal, meaning they are active during the day. They spend about 8.7 hours daily being active. Most of this time is spent feeding, resting, or traveling.

Gibbon à mains blanches (Zoo de Lille Nord)
Gibbon à mains blanches (Zoo de Lille Nord)

While they were once thought to be strictly monogamous, recent studies show more flexibility. Some groups may use polyandry, where one female mates with multiple males. This may help with territory defense or increase genetic quality. To protect their territory, they use loud vocalizations. Every morning, pairs perform a "great call" duet.

These songs can even change if predators like tigers or pythons are nearby.

Reproduction in the wild follows a specific seasonal pattern. Most conceptions occur during the dry season in March. This leads to a peak in births during the rainy season in October.

White-handed Gibbon
White-handed Gibbon

In the wild, females often do not reproduce until they are 11 years old. The gestation period lasts about six months, usually resulting in one offspring. Young gibbons are nursed for about two years and reach maturity at eight years. With a life expectancy of about 25 years, they face many challenges in the wild.

Conservation is a critical issue for the species. Habitat loss is the most pervasive threat to their survival. Forests are cleared for agriculture, roads, and palm oil plantations.

They also face threats from illegal logging and forest fires. Some gibbons are hunted for meat or taken from parents to be kept as pets. Predators like the Sunda clouded leopard and various pythons also pose a risk. Protecting their forest homes is essential to prevent their extinction.

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🖼️ Images & Media (6)
File:Flickr - Shinrya - Tokyo Zoo.jpg
Flickr - Shinrya - Tokyo Zoo.jpg
File:White-handed Gibbon.jpg
White-handed Gibbon.jpg
File:Someone a carrot?? (4032566062).jpg
Someone a carrot?? (4032566062).jpg
File:Gibbon à mains blanches (Zoo de Lille Nord).jpg
Gibbon à mains blanches (Zoo de Lille Nord).jpg
Lar Gibbon hoots.ogg
White-handed Gibbon Ueno Zoo 2009.ogv
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