India is one of the 17 megadiverse nations in the world, hosting nearly 8 percent of known species of flora and fauna despite covering only 2.4 percent of Earth's total surface area. Every year on May 22, the International Day for Biological Diversity is observed globally to highlight the importance of ecosystems, wildlife, forests, rivers, and indigenous practices in sustaining life on the planet. Biodiversity in India extends far beyond popular national parks and scenic forest areas. Many of the country's biodiverse regions are found within sacred groves, cloud forests, mangrove forests, swamp forests, and rainforests on isolated islands, where thousands of rare and endemic species thrive.
Shola Forests, Western Ghats
One of India's unique forest types is the shola forests of the Western Ghats. These montane forests are fragmented and located in areas dominated by grasslands, such as the Nilgiris, Anamalais, Palani Hills, Kudremukh, and Agasthyamalai. The constant mist, cool climate, and isolation have led to high endemism. These forests are home to species like the Nilgiri tahr, Nilgiri marten, black-and-orange flycatcher, laughingthrushes, rare orchids, amphibians, and medicinal plants.
Sacred Groves of Meghalaya
Before formal forest protection laws existed, traditional Khasi and Jaintia communities in Meghalaya protected forests based on religious beliefs. These forests, known as Law Kyntang or Khlaw Kyntang, are among the least disturbed forest fragments in India. The Mawphlang Sacred Grove is famous for hosting unique flora, including rare fungi, orchids, medicinal herbs, lichens, and endemic trees.
Great Nicobar Rainforests
Far from mainland India, the rainforests of Great Nicobar Island represent one of the country's last biodiversity frontiers. These tropical forests harbor endemic birds, reptiles, mangroves, coral ecosystems, and ancient rainforests. The area is a UNESCO biosphere reserve and home to vulnerable indigenous groups like the Shompen and Nicobarese. Rare flora and fauna have adapted to life on this isolated island.
Namdapha Rainforest
Located in eastern Arunachal Pradesh, this tropical rainforest exhibits exceptional biogeographic richness, combining elements from the Himalayas and Southeast Asia. It features tropical evergreen valleys and alpine areas, offering great ecological diversity. The forest is known for clouded leopards, red pandas, hoolock gibbons, hornbills, rare orchids, and a lush canopy. Notably, it is one of the few places where four large felines—tiger, leopard, snow leopard, and clouded leopard—coexist.
Sundarbans Mangrove Forest
The Sundarbans is the world's largest mangrove forest and one of India's most remarkable ecosystems. Here, forests exist amid changing tides, estuarine mudflats, and saline rivers where freshwater meets saltwater. Besides the iconic Royal Bengal tiger, the Sundarbans hosts fishing cats, estuarine crocodiles, river dolphins, mudskippers, kingfishers, mangrove horseshoe crabs, and numerous migratory birds.
Devarakadus of Kodagu
These sacred forests, called Devarakadus, are small community-owned forest pockets in Kodagu. They are the last remnants of Western Ghats flora that have vanished elsewhere. Scientists estimate over a thousand such groves exist in Kodagu alone. They conserve amphibians, birds, endemic flora, reptiles, pollinators, and medicinal plants, and ensure water security.
Silent Valley Rainforest
The evergreen rainforests of Silent Valley are considered vital by conservationists. They represent one of the last untouched tropical rainforests in the Western Ghats. Besides endangered lion-tailed macaques, the forest harbors rare frogs, orchids, insects, endemic birds, and ancient evergreen trees.
Dibang Valley Forests
The forests of Dibang Valley in Arunachal Pradesh belong to the Eastern Himalaya biodiversity hotspot, one of 25 global hotspots. From subtropical valleys to alpine regions, these forests host Mishmi takins, red pandas, rare pheasants, orchids, and medicinal herbs. Its remoteness has preserved relatively untouched wildlife habitats, with ongoing discoveries of insects, amphibians, and plants.
Myristica Swamps of the Western Ghats
The Myristica swamps in Kerala and Karnataka are among India's rarest forest ecosystems. Known as 'living fossil forests,' these freshwater swamp forests have existed for millions of years, composed of primitive trees from ancient Gondwana flora. They support endemic amphibians, reptiles, insects, and swamp flora, with many highly localized species.
Khasi Pine and Cloud Forests
In addition to sacred groves, Meghalaya hosts cloud forests and Khasi pine forests shaped by some of the highest rainfall globally. These habitats support carnivorous plants, orchids, butterflies, amphibians, mosses, and cave ecosystems. Forests near Cherrapunji and Mawsynram exhibit unique characteristics due to rainfall, limestone caves, and waterfalls. The monsoon transforms the area into a biodiversity hotspot.
