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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesThe Andaman and Nicobar Islands are biologically exceptional because geographic isolation has allowed island populations to evolve separately, while the archipelago’s position between the Indian subcontinent and Southeast Asia has brought together several biogeographic lineages. A Zoological Survey of India book documents the endemic fauna produced by that history across forests, coasts and surrounding seas.
The Andaman and Nicobar Islands are biologically exceptional because isolation has allowed island populations to evolve separately, while the archipelago’s position between the Indian subcontinent and Southeast Asia has brought together several distinct biogeographic lineages. Those forces operate across an unusually varied landscape: tropical evergreen forests, mountains, coastal plains, mangroves, coral reefs, seagrass habitats and surrounding seas.
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The result is not simply a large species list. It is a high concentration of endemic species—animals found naturally nowhere else. The Zoological Survey of India’s state-sponsored book Endemic Fauna of Andaman and Nicobar Islands, Bay of Bengal documents that distinctive fauna across mammals, birds, reptiles, amphibians, fish, molluscs, crustaceans, insects, arachnids, corals and many less visible groups.
What the ZSI book set out to document
The Zoological Survey of India (ZSI) publication is a systematic reference to the animals that make the islands biologically distinctive. Its coverage extends beyond the familiar photographs of macaques, megapodes and sea turtles to include invertebrates, marine organisms and microscopic or hard-to-survey life.
The official ZSI archive identifies the book as Endemic Fauna of Andaman and Nicobar Islands, Bay of Bengal. The ZSI publications catalogue lists it as a 183-page publication with ISBN 978-81-8171-475-6. The book is therefore best understood as a specialist biodiversity reference—not as a general travel guide or a complete, permanent inventory of every species on every island.
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For readers who want the underlying reference, the Zoological Survey of India’s Endemic Fauna of Andaman and Nicobar Islands provides the source list and taxonomic treatment behind this account.
First, what does “endemic” mean?
An endemic species has a naturally restricted geographic range. A species endemic to the Andaman and Nicobar Islands occurs there and nowhere else in the wild. It may be widespread within the archipelago, confined to one island, or restricted to a small group of islands.
Endemism is different from rarity. A species can be endemic but locally common, while another can occur across several countries yet be threatened. In the islands, however, restricted range often makes endemism and vulnerability overlap: when a species occupies only one island or habitat, damage in that location can affect a large share—or the whole—of its global population.
1. Isolation gives evolution room to diverge
Island geography is the foundation of the archipelago’s endemism. The Andaman and Nicobar groups are separated from mainland areas and from one another by stretches of sea. Within the islands, channels, mountains, forests, rivers, coastlines and reefs create additional barriers.
When an ancestral population reaches an island, later generations may have little genetic exchange with mainland relatives. Mutation, natural selection, genetic drift and local ecological pressures can gradually produce a distinct population or species. The same process can occur on a smaller scale when populations on different islands become separated from one another.
This is not a claim that every island species evolved in exactly the same way. Some organisms may have arrived more recently, some may be distributed across several islands, and some may have relatives in nearby parts of Asia. The important point is that restricted movement of genes creates conditions in which differences can accumulate.
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Official Indian sources describe the islands as receiving floral influences from Indian, Myanmarese, Malaysian and endemic lineages. Government climate-action material notes that Andaman flora has closer affinities with Indo-Myanmar-Thai regions, whereas Nicobar flora is more closely related to Malaysia and Indonesia. The archipelago is consequently both isolated and connected: isolated enough for divergence, but positioned where several regional biological histories meet.
2. Several biogeographic regions meet in one archipelago
The location of the islands helps explain why their wildlife does not resemble a simplified version of one mainland fauna. The Andaman group has stronger affinities with parts of the Indo-Myanmar-Thai region, while the Nicobar group has closer links with Malaysia and Indonesia.
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These affinities are broad biogeographic patterns, not hard boundaries. Species and lineages can cross ecological and geographic borders over evolutionary time. But the combination of regional influence and island separation creates an unusual mixture: related organisms may have arrived from different directions, then followed separate evolutionary paths after becoming established.
3. A habitat mosaic supports different communities
The islands’ biodiversity is also a consequence of habitat variety. A tropical forest canopy, a forest floor, a freshwater stream, a mangrove creek, a coral reef and a seagrass meadow impose very different conditions. Each supports its own food webs, shelter, breeding sites and specialised organisms.
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Luxuriant evergreen forests cover much of the islands’ terrestrial landscape. Their layered vegetation provides niches for arboreal mammals, birds, reptiles, amphibians, insects and countless smaller organisms. Variation in elevation, rainfall, soil and exposure creates further differences between forest communities.
Mountains and coastal plains
Mountains can separate populations and produce changes in temperature, moisture and vegetation over short distances. Coastal plains provide a contrasting combination of lowland forest, wetlands, beaches and human-use pressures. Together, these landforms increase the number of environments available for specialisation.
Mangroves and shorelines
Mangroves connect land and sea. Their roots provide nursery habitat and shelter, trap sediment and support food chains used by fish, crustaceans, molluscs, birds and other animals. Beaches and rocky shores add nesting, feeding and breeding habitats, including sites used by marine turtles.
Coral reefs and seagrass habitats
The surrounding marine environment is part of the islands’ biodiversity story, not merely a scenic backdrop. Coral reefs support diverse communities of fish, invertebrates and reef-associated organisms. Seagrass meadows are especially important for dugongs and provide habitat for other marine species.
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The Andaman and Nicobar Administration describes tropical evergreen forest and mixed biogeographic influences, while the Forest Department emphasises the importance of both terrestrial and marine animal life. This land–sea continuity is essential to understanding why a relatively small island region can contain such a broad range of organisms.
Great Nicobar shows the concentration of habitats
Great Nicobar is a particularly clear example of habitat complexity. UNESCO describes the Great Nicobar Biosphere Reserve as encompassing approximately 103,870 hectares of tropical evergreen forest ecosystems, including mountain ranges, coastal plains and tropical wet evergreen forests.
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UNESCO records more than 1,800 animal species on Great Nicobar, including endemic mammals, birds, reptiles and amphibians. It also records approximately 650 species of angiosperms, ferns, gymnosperms, bryophytes and lichens. Those figures cover one major island and its protected landscape; they should not be confused with a total for the entire Andaman and Nicobar archipelago.
How many endemic animals are there?
The answer depends on the date, edition, taxonomic treatment and completeness of the inventory. The ZSI book-related account gives 1,032 endemic animal species and subspecies. A current ZSI regional-centre institutional summary reports 1,123 endemic animal species among 11,069 recorded animal species.
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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →| Source context | Figure | How to interpret it |
|---|---|---|
| ZSI book-related account | 1,032 endemic animal species and subspecies | The count documented in the book’s edition and synthesis |
| Current ZSI regional-centre summary | 11,069 recorded animal species; 1,123 endemic animal species | A later institutional total that may reflect additional records and taxonomic revisions |
| Great Nicobar UNESCO description | More than 1,800 animal species | A figure for Great Nicobar, not the whole archipelago |
These numbers are not necessarily contradictory. New surveys can add records, taxonomists can split or combine species, and classifications can change. A careful article should attach each number to its source and date rather than present all of them as if they came from one identical inventory.
Representative animals of the islands
The following examples illustrate the range of habitats and taxonomic groups involved. They are not an exhaustive list, and the presence of a species in the archipelago does not by itself mean that every individual is endemic to the islands.
- Nicobar tree shrew: a distinctive island mammal associated with the Nicobar group.
- Nicobar megapode: a ground-dwelling bird known for its unusual nesting strategy and strongly associated with Nicobar island habitats.
- Crab-eating macaque: a primate included among Great Nicobar’s documented fauna.
- Serpent eagle: one of the birds recorded in the Great Nicobar fauna.
- Dugong: an endangered marine mammal linked to seagrass habitats.
- Saltwater crocodile: a large coastal and estuarine predator.
- Marine turtles: reptiles that depend on both coastal nesting areas and marine feeding grounds.
- Reticulated python: a large reptile recorded among Great Nicobar’s fauna.
The dugong is a useful reminder that island biodiversity cannot be measured only by counting land animals. A conservation plan that protects forest but damages seagrass, reefs or nesting beaches can still undermine the wider ecological system.
Why the book’s invertebrate coverage matters
Charismatic mammals, birds and reptiles attract attention, but they represent only a small portion of island biodiversity. The ZSI book’s scope includes insects, arachnids, molluscs, crustaceans, sponges, corals, worms, protozoans and meiofauna, as well as fishes and amphibians.
These groups perform essential ecological roles. Insects pollinate plants and break down organic matter. Crustaceans and molluscs occupy important positions in aquatic and coastal food webs. Corals build reef structure, while microscopic organisms and meiofauna support the base of many marine and sediment-based ecosystems.
Documenting these animals is difficult: many are small, seasonal, hidden in soil or leaf litter, restricted to particular reef or sediment conditions, or difficult to distinguish without specialist taxonomy. Their inclusion makes the ZSI volume more valuable than a conventional wildlife guide because it treats endemism as an ecosystem-wide phenomenon.
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Are the Andaman and Nicobar Islands officially a global biodiversity hotspot?
This needs a qualification. In the internationally used Conservation International hotspot framework, a region must contain at least 1,500 endemic vascular plant species and have lost at least 70% of its original primary native vegetation. “Biodiversity hotspot” therefore has a specific technical meaning; it is not simply a synonym for a beautiful or species-rich place.
Indian government material identifies the Nicobar group as part of the Sundaland biodiversity hotspot. Other official Indian sources describe the wider Andaman and Nicobar archipelago as a biodiversity hotspot or as a high-endemism hotspot-like island region.
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The most precise wording is therefore: the Andaman and Nicobar Islands are a globally important high-endemism region, while the Nicobar group forms part of the Sundaland biodiversity hotspot. Calling the entire archipelago one independently named global hotspot without this distinction is too broad.
Why exceptional biodiversity also means exceptional vulnerability
Isolation creates uniqueness, but it can also create fragility. A species with a restricted range has fewer places to go when its habitat changes. A population confined to one island may be exposed to a single major disturbance across much of its global range.
Government sources identify habitat destruction, resource mismanagement, poaching and climate change among the pressures affecting hotspot biodiversity. Marine habitats are vulnerable as well, particularly where changes to coastlines, water conditions, reefs, seagrass beds or nesting beaches affect species that depend on several connected environments.
Other risks follow from the same island geography. Small or isolated populations may have less ability to recover from storms, fires, disease, invasive species or illegal collection. These are ecological implications of restricted ranges; the severity of any particular threat varies by species, island and habitat.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThe islands should not be described as “untouched.” They have human histories, settlements, traditional relationships with the environment, administrative management and conservation conflicts. Their importance lies in the biological distinctiveness of their ecosystems, not in the absence of people or change.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why documenting species is a conservation tool
The ZSI book is a major synthesis, not a final inventory. The ZSI regional centre continues to maintain a national repository for island faunal diversity and reports research publications, training and conservation expertise. Species totals and distributions can change as scientists survey less-studied habitats, identify previously overlooked organisms and revise taxonomy.
Reliable documentation supports practical decisions. Managers need to know:
- which species occur in a particular island or habitat;
- which populations are genuinely restricted or declining;
- where breeding, feeding and nesting sites are located;
- which forests, mangroves, reefs and seagrass beds require protection;
- how to monitor changes over time; and
- which species may be at risk from development, poaching, climate change or other pressures.
Without names, distributions and habitat information, conservation priorities are difficult to set. A taxonomic reference may seem less dramatic than a wildlife documentary, but it supplies the baseline on which surveys, protected-area planning and long-term monitoring depend.
What makes the islands biodiversity hotspots, in one explanation?
- Geographic isolation limits gene flow. Separated island populations can diverge from mainland relatives and from one another.
- The archipelago sits at a biogeographic crossroads. Andaman and Nicobar flora and fauna show relationships with South and Southeast Asian lineages.
- Many habitats occur close together. Evergreen forests, mountains, coastal plains, mangroves, coral reefs and seagrass meadows support different communities.
- Endemism is spread across the tree of life. The distinctive fauna includes not only mammals and birds but also insects, molluscs, crustaceans, corals and microscopic organisms.
- Restricted ranges increase conservation risk. Habitat damage or other disturbances can affect a disproportionate share of a species’ global population.
The state-sponsored ZSI book captures the central fact behind the islands’ importance: their biodiversity is valuable not merely because many animals occur there, but because so many have evolved in highly specific island settings and exist nowhere else. The same geography that produced this uniqueness also makes careful habitat protection and continued scientific documentation essential.
Frequently Asked Questions
What is an endemic species?
An endemic species is one that occurs naturally in a particular geographic area and nowhere else in the wild. In the Andaman and Nicobar Islands, some species are endemic to the whole archipelago, while others may be restricted to one island or island group.
How many endemic animal species are found in the Andaman and Nicobar Islands?
The ZSI book-related account documents 1,032 endemic animal species and subspecies. A later ZSI regional-centre summary reports 1,123 endemic animal species among 11,069 recorded animal species. The difference may reflect newer records and taxonomic revisions.
Are all the Andaman and Nicobar Islands part of one global biodiversity hotspot?
The Nicobar group is part of the Sundaland biodiversity hotspot under the internationally used framework. The wider Andaman and Nicobar archipelago is more accurately described as a globally important high-endemism region or hotspot-like island region unless the specific classification being used is explained.
What kind of book is Endemic Fauna of Andaman and Nicobar Islands?
No. The book is a specialist biodiversity reference and systematic account of endemic fauna, covering vertebrates as well as insects, molluscs, crustaceans, corals, sponges, worms, protozoans and meiofauna. It is not a general travel guide or a permanent final inventory.
The Bottom Line
The Andaman and Nicobar Islands are a globally important high-endemism region because isolation, Southeast Asian and Indian biogeographic influences, and a tightly packed mosaic of land and marine habitats have encouraged species to diverge. The Nicobar group is part of the Sundaland biodiversity hotspot, while the wider archipelago is more precisely described as a hotspot-like island region with exceptional endemism. The ZSI’s Endemic Fauna of Andaman and Nicobar Islands provides a valuable baseline for understanding—and conserving—that wildlife.
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