The Endemic Mammals of Western Ghats

The Western Ghats, an ancient and significant mountain range, stretch parallel to the western coast of India and are older than the Himalayas. This mountain chain showcases geomorphological features that hold immense ecological and biophysical importance in India. These high montane forest ecosystems play a crucial role in influencing the Indian monsoon, moderating the tropical climate, and representing one of the most vivid examples of a monsoon system globally.

One of the most remarkable attributes of the Western Ghats is their extraordinary biological diversity and endemism. Recognized as one of the world’s eight ‘hottest hotspots’ for biodiversity, the region is home to a wide array of ecosystems, from tropical wet evergreen forests to montane grasslands. These habitats harbor over 325 globally threatened species, encompassing flora, fauna, birds, amphibians, reptiles, and fish. The non-equatorial tropical evergreen forests found here are among the best globally and contribute substantially to ecological stability.

The Western Ghats in India stretch from the Tapti River in the north to the southern tip of India, forming a diverse landscape rich in endemic plant and animal species. This positioning makes the region unique biogeographically, effectively creating a biodiversity treasure trove. It also supports numerous medicinal plants and genetic resources crucial for the sustainability of crops such as grains, fruits, and spices. Notably, the unique shola ecosystem comprises montane grasslands interspersed with evergreen forest patches, further enhancing the region’s ecological complexity.

Beyond biodiversity, the Western Ghats play a critical role in hydrology. They perform essential watershed functions, providing water to approximately 245 million people living in the peninsular states of India. The rivers originating from this range are vital for irrigation, drinking water, and sustaining agriculture, underlining the region’s direct impact on human livelihoods. Unlike other biodiversity hotspots, with the exception of the Indo-Malayan region, no other such region influences the lives of such a vast population so profoundly.

 

Endemism in Western Ghats of India

Endemism in the Western Ghats is strikingly high, making it one of India’s most biologically unique regions. This range hosts over 30% of India’s plant, fish, herpeto-fauna, bird, and mammal species, with many found nowhere else.

Starting with plants, the Western Ghats boast around 4,500 species of flowering plants, of which 1,788 are endemic to the region. Orchids, a remarkable group within this flora, include 107 species, 35% of which are endemic, though some face endangerment due to habitat loss. Impatiens, a genus known for its vibrant flowers, is also well-represented here, with 77 out of 175 species endemic to the Ghats. Additionally, palms in this region show endemism, with 9 of the 21 species found only within the Western Ghats. These plant species contribute to the distinct ecosystems of the Ghats, such as the shola forests—a unique blend of montane grasslands and evergreen patches.

 

 

The diversity of amphibians and reptiles is equally impressive. About 50% of India’s amphibian species, including numerous frogs, and 67% of fish species, inhabit this region exclusively. These species thrive in the moist forests and wetlands that provide ideal habitats, but their restricted ranges make them particularly vulnerable to environmental changes. The unique climatic conditions of the Ghats have also fostered the evolution of endemic reptiles, many of which are adapted to specific elevations and habitats within this mountain range.

Birdlife in the Western Ghats includes a variety of endemics, such as the Malabar grey hornbill, Nilgiri flycatcher, and the White-bellied blue robin. These species depend on the dense forest canopies and diverse plant life, which offer nesting sites, food sources, and protection. The avian endemism in the Ghats not only showcases the region’s rich biodiversity but also underscores its conservation importance, as these birds play crucial ecological roles in seed dispersal and pest control.

Among small mammals, the Western Ghats are home to unique species like the Malabar large-spotted civet and the Nilgiri marten, both of which have adapted to the forests’ dense undergrowth. The highly endangered lion-tailed macaque, recognized by its mane and tail tuft, is one of the most iconic endemics in the region. This primate’s limited distribution within certain forest patches makes its conservation crucial, as it faces threats from habitat loss and fragmentation.

The Western Ghats are also home to some of India’s most celebrated megafauna. Around 30% of the global population of Asian elephants and 17% of the world’s tigers inhabit these forests, with their protection ensured by a network of wildlife sanctuaries, national parks, and tiger reserves. This assemblage of large mammals highlights the Ghats as a crucial refuge for endangered species, whose survival depends on the region’s unique ecosystems.

The rarity and restricted ranges of these species confer high conservation value on the Western Ghats. The threats from habitat destruction, developmental pressures, and exploitation emphasize the need for focused conservation efforts to protect this globally significant hotspot.

Also Read : Endemic Birds of Andaman & Nicobar Islands

 

 

Major Endemic Mammals:

Nilgiri Tahr (Nilgiritragus hylocrius)

IUCN Status: Endangered

The Nilgiri Tahr is a striking mountain goat found in the montane grasslands and rocky crags interspersed with shola forests or stunted montane wet evergreen forests of the Nilgiris. Males and females have distinct physical characteristics. The male Nilgiri Tahr is reminiscent of a smaller version of the male Himalayan Tahr but lacks the flowing mane and long hair. It has a robust build, and adult males develop a unique blue-black color grizzled with white hair. They also feature a short, bristly mane that runs from the nape to mid-back and a characteristic pale or whitish saddle-shaped patch behind the mane, earning them the regional name “saddleback.”

Females, in contrast, have a shorter, greyish-brown coat with whitish underparts and a buff patch around the eyes and muzzle. Their legs are darker than their body and are marked by a distinct dark spot above the knees.

One of the unique social behaviors of the Nilgiri Tahr is the presence of a sentinel while the herd rests during the hot afternoon hours. Unlike other caprid species, this sentinel role can be filled by an adult female as often as by a subadult male.

 

 

Nilgiri Marten (Martes gwatkinsii)

IUCN Status: Vulnerable

The Nilgiri Marten is the largest and rarest marten species in India, inhabiting the montane and evergreen forests of the Western Ghats, at altitudes ranging from 120 to 2,900 meters. This elusive animal has a distinctive appearance, characterized by its dark brown to black fur and a striking pale yellow to bright yellowish-orange patch on its neck.

The Nilgiri Marten also has a unique skull structure with a flat shape and a concave depression on the forehead. It is highly arboreal and frequently seen at the canopy level, showcasing its adept climbing abilities, though it is equally comfortable on the ground. 

Also Read : Exploring India’s wilderness

 

Malabar Civet (Viverra civettina)

IUCN Status: Critically Endangered 

The Malabar Civet is recognized as the most endangered civet species and is possibly the most critically endangered mammal in India. This rare animal was last reported in Kerala in 1990. Comparable in size to the Large Indian Civet, the Malabar Civet has a distinctive long, grey coat, making it stand out among other civet species. Its body pattern features blackish markings that are more pronounced than those of smaller civets.

A notable characteristic of the Malabar Civet is its prominent black dorsal crest, which extends from the neck down to the tip of its tail. Adding to its unique appearance, the tail bears five white rings, with the final ring situated approximately two inches from the tip. The Malabar Civet has been reported in highly degraded lowland forests and cashew plantations.

 

Lion-tailed Macaque (Macaca silenus)

IUCN Status: Endangered 

The Lion-tailed Macaque inhabits the dense evergreen and semi-evergreen forests of southern India, typically at elevations ranging from 1,000 to 1,700 meters. This medium to large-sized macaque is distinguished by its dark, glossy coat and a distinctive long, grey facial mane. Another notable feature is its medium-sized tail, which ends with a prominent tuft of longer hair, giving it a lion-like appearance.

Unlike the Nilgiri Langur, the Lion-tailed Macaque can be identified by these unique physical traits. Females are slightly smaller than males and exhibit a pink swelling in the perineal area and at the base of the tail when in oestrus, indicating their reproductive readiness. The call of this species is particularly noteworthy, as it resembles human sounds, often described as a ‘coyeh’ or a ‘coo.’ 

 

 

Nilgiri Langur (Semnopithecus johnii)

IUCN Status: Vulnerable

The Nilgiri Langur is a distinctive primate primarily found in the rainforests of the Western Ghats, at altitudes above 500 meters. It can also inhabit deciduous patches, plantations, and the edges of such areas. Slim and strikingly black, the Nilgiri Langur is known as the common rainforest monkey of the region. One of its notable features is its yellow-tinted hair on the head, giving it a unique coiffure, coupled with a long, glossy black coat. Female Nilgiri Langurs possess a characteristic white patch on the inside of their thighs. 

Newborn Nilgiri Langurs start life with pinkish-white skin and reddish hair, which gradually turns black within two to three months. Among southern forest monkeys, they are recognized as the most vocal, emitting a distinctive ‘hoo-hoo’ call primarily at dawn and occasionally at dusk. 

 

 

In conclusion

The Western Ghats stand as a bastion of unique biodiversity, particularly for their endemic mammals. The presence of species such as the Nilgiri Tahr, Lion-tailed Macaque, Nilgiri Langur, Malabar Civet, and Nilgiri Marten highlights the region’s ecological significance and unparalleled evolutionary history. These mammals, with their specialized adaptations and restricted ranges, underscore the critical need for targeted conservation efforts. Preserving these animals goes beyond protecting their individual species; it ensures the survival of complex ecosystems that support a wide array of life. The continued existence of these endemic mammals depends on proactive measures to combat habitat loss, deforestation, and other human-induced threats. Safeguarding the Western Ghats’ rich natural heritage is not just a regional imperative but a global one, emphasizing our collective responsibility toward preserving one of the world’s most extraordinary biodiversity hotspots.