Sumatran tiger

This tiger lives on the island of Sumatra.

It has dark fur. Its black stripes are very wide. Some stripes turn into small spots.

These tigers are small for their kind. Male tigers have thick hair around their necks.

They like to live in thick forests. They stay away from places where many people live.

These tigers need large forests to stay healthy. We must work to keep their homes safe.

The Sumatran tiger lives on the island of Sumatra.

It is the last tiger type left in the Sunda Islands. Other tigers, like the Bali tiger, are now extinct.

These tigers have dark fur. Their black stripes are wider than other tigers. Some stripes turn into small spots on their bodies.

Male tigers have thick hair around their necks called a ruff. Sumatran tigers are also one of the smallest tiger groups.

Long ago, sea levels rose. This change cut off the island from other lands. Because of this, the tigers became a separate group. This is called genetic isolation. They are now different from tigers on the mainland.

These tigers like thick forests. They prefer hills and places with lots of plants. They stay away from areas with many people.

Today, they face many threats. They are losing their forest homes to farms. People also hunt them illegally. Many groups now work to protect their habitat.

The Sumatran tiger is a unique group of tigers living on the Indonesian island of Sumatra.

They are the only tigers left in the Sunda Islands. Other groups, such as the Bali and Javan tigers, became extinct during the 20th century. Scientists use the name Panthera tigris sondaica to describe them. This name covers both the living tigers and those that are gone. These animals are very important to the natural world of Indonesia. They help keep the balance of the forests where they live.

These tigers have a very specific look that sets them apart. Their fur is darker than many other tiger types. They have broad stripes that are more frequent than in other subspecies. Near the ends of these stripes, the lines often turn into small spots. On their backs and legs, you can see small dark spots between the stripes. Male tigers also have a thick ruff of hair around their necks. Sumatran tigers are also one of the smallest tiger groups in the world.

How did they become so different from other tigers? Scientists believe they became isolated a long time ago. Between 12,000 and 6,000 years ago, sea levels rose during the Pleistocene to Holocene transition. This rising water cut the island off from other lands. Because they were stuck on the island, they could not meet other tigers. This created genetic isolation, which means their DNA changed on its own. Today, their DNA shows they are a distinct group from mainland tigers.

Sumatran tigers live in many different parts of their island. They can be found in lowland forests or high mountain forests.

Some live in Bukit Barisan Selatan National Park in Lampung Province. Others live in Gunung Leuser National Park in Aceh Province. In 2011, the Kerinci Seblat National Park had about 165 to 190 tigers. This was the largest group found in one place on the island. In 2017, the total number of tigers on Sumatra was estimated at 618.

Protecting these tigers is a very big job for many people. They face hard jobs like losing their forest homes to plantations. Many forests are turned into farms for oil palm or acacia trees. Tigers also face dangers from illegal hunting and traps.

To help, groups like the Sumatran Tiger Project began working in 1995. Other groups work with places like the Australia Zoo to help tigers. These efforts aim to keep the forests safe and reduce conflicts with people. Keeping the forests thick and wild is the best way to help them thrive.

The Sumatran tiger, known scientifically as *Panthera tigris sondaica*, is a unique population of tigers found on the Indonesian island of Sumatra.

They represent the only surviving tiger population within the Sunda Islands. Other regional groups, specifically the Bali and Javan tigers, became extinct during the 20th century. This subspecies is considered diagnostically distinct from mainland tigers due to specific genetic markers. Understanding these tigers is vital for studying island evolution and biodiversity. Their survival is closely tied to the health of the Indonesian rainforests.

The distinct appearance of the Sumatran tiger is a result of its specific evolutionary path. They possess darker fur coloration compared to many other subspecies. Their stripes are notably broader and occur with higher frequency. Near the ends of these stripes, the pattern often dissolves into small, dark spots. These spots also appear on the back, flanks, and hind legs between the regular stripes.

Male tigers also feature a prominent ruff of hair around their necks. Physically, they are among the smallest tigers in existence. Males reach a head-to-body length of 220 to 250 cm and weigh 100 to 140 kg. Females are smaller, weighing between 75 and 110 kg with a maximum length of 220 cm.

Evolutionary analysis suggests that these tigers became genetically isolated from mainland populations long ago. This isolation occurred during the Pleistocene to Holocene transition, roughly 12,000 to 6,000 years ago. During this time, rising sea levels separated the island of Sumatra from other landmasses. This physical barrier prevented gene flow between island and mainland tigers. Consequently, the Sumatran tiger developed unique mitochondrial DNA and microsatellite alleles. Today, they maintain high genetic variability that sets them apart from all living mainland groups.

Sumatran tigers inhabit a variety of environments across the island. They range from sea-level coastal lowland forests to high mountain forests.

For example, they live in Bukit Barisan Selatan National Park in Lampung Province and Gunung Leuser National Park in Aceh Province. They prefer uncultivated forests with dense understory cover and steep slopes. They generally avoid areas with high human influence, such as settlements or heavy logging. They also show a strong preference for higher elevations and lower annual rainfall. While they prefer natural forests, they may occasionally use the fringes of human-dominated landscapes.

Population numbers for these tigers have changed significantly over the last few decades. In 1978, surveys estimated there were 1,000 individuals remaining. By 1992, that number had dropped to an estimated 400 to 500 tigers. In 2011, the Kerinci Seblat National Park held a significant population of 165 to 190 tigers. This park showed a very high tiger occupancy rate of 83%. However, the total population for all of Sumatra was estimated at only 618 individuals in 2017. These figures highlight the ongoing struggle for the subspecies to maintain stable numbers.

Several major threats jeopardize the continued existence of the Sumatran tiger. Habitat loss is a primary driver, often caused by the expansion of acacia and oil palm plantations. This loss of forest reduces the available space for tigers to hunt and live. Additionally, the depletion of their prey base makes survival more difficult. Tigers rely on various species, including the Malayan tapir, banded pig, and various deer species. Illegal trade and poaching also pose severe risks to the population. Poachers use wire snares to target tigers, and tigers are sometimes accidentally caught in traps meant for other animals.

Conservation efforts have been launched to address these complex challenges. The Sumatran Tiger Project began in 1995 near Way Kambas National Park to study tiger life history and ensure long-term viability. Other international collaborations, such as those involving the Australia Zoo, focus on rehabilitation and reintroduction. In Indonesia, there is increasing political momentum to protect biodiversity and reduce deforestation. Between 2005 and 2015, approximately US$210 million was invested in tiger law enforcement and forest ranger patrols. These programs aim to reduce human-tiger conflict and protect the vital forest blocks these predators require.