Rajasthan Flora and Fauna: Biodiversity Hotspots and Protected Species for RAS

Rajasthan flora and fauna represent one of India's most ecologically significant yet challenging ecosystems. For RAS (Rajasthan Administrative Service) Prelims aspirants, understanding the biodiversity hotspots, protected species, and conservation status of Rajasthan is important. The state covers 10.4% of India's land area but supports highly varied ecosystems and species—from the arid Thar Desert to riparian zones and wildlife sanctuaries. This comprehensive guide decodes Rajasthan's biodiversity with exam-relevant precision, featuring official data, species profiles, and practice questions for the RPSC RAS Prelims syllabus.

Rajasthan Biodiversity: An Overview

Rajasthan's biodiversity is paradoxical. While 60% of the state is covered by arid and semi-arid zones, it remains a critical habitat for endemic and vulnerable species. The state's flora and fauna are shaped by three dominant ecosystems: the Thar Desert, deciduous forests, and wetlands.

According to the Rajasthan Biodiversity Strategy and Action Plan (RBSAP) 2016-2025, the state hosts:

• 2,500+ plant species (including 500+ endemic species)
• 680+ vertebrate fauna species
• 150+ mammal species
• 500+ bird species
• 4,400+ insect species

India is divided into 10 biogeographic zones as per the Wildlife Institute of India (WII) classification; Rajasthan itself falls mainly in the Desert and Semi-arid zones, making this topic part of the ecology/environment portion of the RAS Prelims General Knowledge & General Science paper.

Major Ecosystems and Flora of Rajasthan

Thar Desert Flora

The Thar Desert dominates western Rajasthan, covering approximately 60% of the state's area. Rajasthan flora adapted to arid conditions includes:

• Khejri (Prosopis cineraria): State tree of Rajasthan; nitrogen-fixing drought-resistant species
• Neem (Azadirachta indica): Multi-purpose tree with medicinal properties
• Acacia species: Acacia senegal, A. nilotica (babul) are critical for fuel and fodder
• Euphorbia and Suaeda species: Succulent halophytes tolerating saline soils

Key adaptation features: Xerophytic characteristics, deep root systems, reduced leaf surface, and seasonal dormancy during droughts.

Dry Deciduous Forest Flora

Eastern and southeastern Rajasthan (Kota, Bundi, Chittorgarh districts) harbor dry deciduous forests classified as Type 5C (Dry Deciduous Forest) under Champion & Seth classification.

Major species:

• Teak (Tectona grandis): Premium timber species; restricted to southern districts
• Dhok/Phalai (Anogeissus pendula): Dominant canopy species; erosion control
• Sal (Shorea robusta): Limited presence; requires higher rainfall
• Mahua (Madhuca longifolia): Oil-yielding tree; tribal subsistence importance
• Tendu (Diospyros melanoxylon): Leaves used for bidi production

Grassland and Wetland Flora

Rajasthan's riparian zones and wetlands support distinct flora:

• Sagwan forests (Tectona grandis plantations): Productivity 1.5-2 tonnes/hectare
• Dhok forests: Supporting grass communities for pastoral systems
• Wetland vegetation: Water-hyacinth, reeds, sedges in Lake Sambhar, Anasagar, Pichola

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Rajasthan Fauna: Iconic and Endangered Species

Mammals of Conservation Significance

Rajasthan fauna includes several globally significant mammalian species:

Indian Gazelle / Chinkara (Gazella bennettii)

• Distribution: Throughout arid Rajasthan (endemic to Indian subcontinent)
• Population: Estimated 6,000-8,000 in Rajasthan
• Threats: Habitat loss, poaching
• Found in: Desert National Park, Tal Chhapar Sanctuary

Blackbuck (Antilope cervicapra)

• Stronghold: Tal Chhapar Wildlife Sanctuary (2,000+ individuals)
• Status: Least Concern (IUCN); population recovered strongly since the 1990s
• Unique feature: Males exhibit twisted horns; sexual dimorphism
• Breeding season: July-October

Sloth Bear (Melursus ursinus)

• Habitat: Dry forests of south-central Rajasthan (Ranthambhore, Mukundra Hills)
• Status: Vulnerable; Schedule-I protection
• Population: 150-200 individuals
• Threats: Habitat fragmentation, human-wildlife conflict

Bengal Tiger (Panthera tigris tigris)

• Reserves: Rajasthan has four tiger reserves — Ranthambhore (1973), Sariska (1978), Mukundra Hills (notified 2013) and Ramgarh Vishdhari (notified 2022)
• Corridor: Ranthambhore-Kuno corridor (cross-state movement)
• Census: The All-India Tiger Estimation 2022 reported a rising national tiger population (2,967 in 2018 to 3,167 in 2022)
• Status: IUCN-Endangered; Schedule-I

Avifauna Hotspots

Rajasthan ranks among India's top birding destinations with 500+ recorded species.

Migratory Hotspots

• Lake Sambhar: 175 bird species; designated Ramsar site (1990)
• Tal Chhapar Sanctuary: Demoiselle cranes (Anthropoides virgo); 10,000-15,000 individuals migrate September-March
• Nakki Lake, Mount Abu: 200+ species; Nilgai, sambar deer coexist

Endemic and Threatened Birds

• Lesser Florican (Sypheotides indicus): Critically endangered; one of India's rarest grassland birds, with breeding grounds mainly in Rajasthan, Gujarat and Madhya Pradesh
• Great Indian Bustard (Ardeotis nigriceps): Critically endangered; population <200 globally; Desert National Park is stronghold
• Pallid Harrier (Circus macrourus): Winter migrant; Rajasthan is key wintering ground
• Indian Eagle-Owl (Bubo bengalensis): Found in rocky and riparian habitats across Rajasthan

Reptiles and Herpetofauna

• Indian Cobra (Naja naja): Highly venomous; cultural significance in Rajasthan
• Russell's Viper (Daboia russelii): Responsible for highest human mortality among snake bites
• Mugger Crocodile (Crocodylus palustris): Freshwater ecosystems; reintroduced in Lake Pichola
• Monitor Lizards: Varanus bengalensis (common); V. salvator (rare)
• Gharial (Gavialis gangeticus): Critically endangered; status unknown in Rajasthan

State Symbols

• Wildlife
  • State animal (wildlife): Chinkara, declared 1981
• Livestock
  • State animal (livestock): Camel, declared 2014
• Birds
  • State bird: Godawan / Great Indian Bustard, declared 1981
• Plants
  • State tree: Khejri (Prosopis cineraria), declared 1981
  • State flower: Rohida (Tecomella undulata), declared 1983

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Protected Areas and Biodiversity Hotspots

Tiger Reserves (Project Tiger)

Rajasthan has four tiger reserves:

Exact tiger counts per reserve change with each census cycle; see the official NTCA/Project Tiger status report for current numbers.

National Parks

Desert National Park (Jaisalmer)

• Area: 3,162 sq km
• Flora: Khejri, acacia, halophytes
• Fauna: Chinkara, nilgai, golden jackal, great Indian bustard
• Established: 1980
• Significance: Largest hot desert ecosystem hotspot in India

Ranthambhore National Park (Sawai Madhopur)

• Area: 392 sq km core zone
• Flora: Dry deciduous, dhok forests
• Fauna: Tigers, leopards, sloth bears, sambar, chital
• Established: 1980 (formerly hunting ground of Jaipur rulers)

Wildlife Sanctuaries (Key Exam-Relevant)

Tal Chhapar Wildlife Sanctuary (Churu)

• Area: 7.19 sq km (smallest in Rajasthan)
• Specialty: Demoiselle cranes, blackbuck
• Designation: Wildlife sanctuary (declared 1962); it is not a Ramsar site — Rajasthan's Ramsar sites are Keoladeo (1981), Sambhar (1990), and Khichan, Menar and Siliserh (added 2025)
• Habitat: Grassland-wetland mosaic

Mount Abu Wildlife Sanctuary

• Area: 288 sq km
• Flora: Subtropical forests; transition zone between Deccan and Aravalli
• Fauna: Sambar, muntjac, leopard, paradise flycatcher
• Significance: Highest point in Rajasthan (1,722 m); endemic species concentration

Kumbhalgarh Wildlife Sanctuary (Rajsamand)

• Area: 610 sq km
• Flora: Dry deciduous, mixed forests
• Fauna: Panther, sambar, chital, sloth bear
• Features: Fort walls within sanctuary; grazing restrictions

Mukundra Hills Tiger Reserve (Kota)

• Area: 1,218 sq km
• Flora: Sal, teak, khair, bamboo
• Fauna: Tigers, leopards, wild boar, nilgai
• Note: Cheetahs have not been introduced here — India's reintroduced cheetahs are at Kuno National Park, Madhya Pradesh; Mukundra Hills has only been discussed as a possible future relocation site

Tal Chhapar and Sambhar Lake Comparison

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Endemic and Endangered Species of Rajasthan

Flora of Conservation and Medicinal Interest

• Salvadora persica (Peelu): Arid-zone species; medicinal value; facing habitat loss in western Rajasthan
• Euphorbia caducifolia: Succulent species used in local medicine
• Calotropis procera: Used in traditional medicine

(These species are not formally IUCN Critically Endangered — they are flagged here for habitat loss and over-collection pressure, not extinction risk.)

Fauna—Critically Endangered

Note: the Indian Wild Ass (Equus hemionus khur) is not a Rajasthan species — it is found in the Little Rann of Kutch, Gujarat.

IUCN Red List 2024; Rajasthan Forest Department records

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Human-Wildlife Conflict and Conservation Challenges

Conflict Hotspots

1. Tiger-Human Interface (Ranthambhore periphery): 5-8 human deaths annually; livestock predation
2. Leopard Incursions (Urban Jaipur/Udaipur): 10-12 incidents yearly; increasing urban encroachment
3. Nilgai Crop Raiding: Feral populations damaging agriculture; no legal hunting allowed
4. Sloth Bear Attacks: 15-20 incidents annually in south-central Rajasthan

State-Level Initiatives

• Rajasthan Habitat Restoration Scheme (2015): ₹50 crore investment; 50,000 hectares target
• Community Conserved Area Network: 100+ village-level conservation groups
• Human-Wildlife Conflict Mitigation Fund: ₹5 crore annually for compensation and insurance

(Note: cheetahs have not been introduced in Rajasthan — India's reintroduced cheetahs are at Kuno National Park, Madhya Pradesh.)

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Rajasthan Flora and Fauna: RAS Syllabus Alignment

RAS Prelims is a single objective paper — "General Knowledge & General Science" (150 questions, 200 marks, 3 hours, qualifying only). Ecology, environment and biodiversity questions fall under its Science & Technology section, alongside other GK topics; there is no separate GS-I/GS-II split at the Prelims stage (that structure applies to RAS Mains).

Topics regularly tested from this chapter:

1. State wildlife sanctuaries, national parks and tiger reserves and their biodiversity
2. Endangered species and IUCN status
3. Endemic flora/fauna of Rajasthan
4. Ramsar Sites and wetland conservation
5. Project Tiger and tiger reserve basics (location, year, district)

(Past papers show these recur regularly; we avoid quoting an exact question count per topic since it varies year to year.)

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Key Takeaways

• Rajasthan's flora and fauna are shaped by its Desert and Semi-arid biogeographic zones (part of India's 10 WII zones), with 2,500+ plant species and 680+ vertebrate species adapted to arid, deciduous, and wetland ecosystems—a regular source of RAS Prelims ecology questions.

• Rajasthan's four Tiger Reserves (Ranthambhore, Sariska, Mukundra Hills, Ramgarh Vishdhari) and National Parks (Desert, Ranthambhore) protect flagship species like Bengal tigers, sloth bears, and great Indian bustards. Cheetahs have not been reintroduced in Rajasthan — India's cheetahs are at Kuno National Park, Madhya Pradesh.

• Tal Chhapar (7.19 sq km grassland) hosts demoiselle cranes and blackbuck but is not a Ramsar site; Lake Sambhar (240 sq km salt lake) is a Ramsar Site (1990) hosting migratory waterfowl — a common habitat-matching trap in RAS Prelims.

• Critically endangered species (Great Indian Bustard <50 in Rajasthan, Lesser Florican) and vulnerable taxa (leopards 600-800, chinkara 6,000-8,000) demonstrate Rajasthan's conservation priority but fragile status.

• Human-wildlife conflict (tiger and leopard incidents near reserve boundaries) and state initiatives (Habitat Restoration Scheme, conflict mitigation fund) reflect conservation-development tension that RAS Prelims and Mains both test.

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Frequently Asked Questions

Q: What is the most endangered species in Rajasthan and why is it critically threatened?

A: The Great Indian Bustard (Ardeotis nigriceps) is the most critically endangered species in Rajasthan with a global population of <200 individuals. In Rajasthan, <50 are estimated to survive, primarily in Desert National Park. Threats include: (1) habitat loss due to desert afforestation and agricultural expansion, (2) collision with power transmission lines, (3) grazing pressure reducing grassland quality, and (4) poaching. The species is listed as Critically Endangered (CR) by IUCN and Schedule-I under the Wildlife Protection Act, 1972.

Q: How many tiger reserves does Rajasthan have and what is their significance for the RAS exam?

A: Rajasthan has four tiger reserves: (1) Ranthambhore Tiger Reserve (Sawai Madhopur; notified 1973; 1,334 sq km), (2) Sariska Tiger Reserve (Alwar; notified 1978; 1,203 sq km), (3) Mukundra Hills Tiger Reserve (Kota; notified 2013; 1,218 sq km), and (4) Ramgarh Vishdhari Tiger Reserve (mainly Bundi; notified 2022; about 1,502 sq km, Rajasthan's newest). For RAS Prelims, this is important because: tiger reserves represent Project Tiger implementation, candidates must distinguish between reserve areas and national park zones, species composition differences reflect ecosystem variation (dry deciduous vs. mixed forests), and the district + notification year of each reserve is frequently tested. Ranthambhore's human-wildlife interface near settlements is a policy question focus.

Q: What distinguishes Tal Chhapar from Lake Sambhar as biodiversity hotspots?

A: Tal Chhapar is a small (7.19 sq km) grassland-wetland sanctuary in Churu district — it is a blackbuck stronghold and a wintering ground for migratory demoiselle cranes (September-March), but it is not a Ramsar site. Lake Sambhar is a large (240 sq km, seasonal) hypersaline salt lake spanning Jaipur/Nagaur districts, designated a Ramsar Site in 1990, hosting around 175 bird species including flamingos and diverse migratory waterfowl. Exam distinction: Tal Chhapar tests grassland ecology and endemic avifauna knowledge; Lake Sambhar tests wetland salinity adaptation, migratory patterns, and Ramsar status. A frequent exam trap is assuming both are Ramsar sites — only Sambhar is.

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Practice Questions

1. The Great Indian Bustard, critically endangered in Rajasthan, faces maximum threat from:

a) Overgrazing and habitat fragmentation
b) Collision with power transmission lines and habitat loss
c) Poaching for feathers only
d) Competition from feral horses

Answer: b) Collision with power transmission lines and habitat loss

Explanation: While all factors contribute, collision with high-voltage power lines (particularly in Desert National Park region) and habitat loss due to agricultural expansion and afforestation of natural grasslands are the primary drivers of GIB population decline. Poaching is secondary; competition with horses is minimal.

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2. Which of the following pairs correctly matches a Rajasthan wildlife sanctuary/reserve with its primary conservation focus species?

a) Mukundra Hills Tiger Reserve – Asiatic Lion
b) Mount Abu Wildlife Sanctuary – Demoiselle Cranes
c) Tal Chhapar Wildlife Sanctuary – Blackbuck and Demoiselle Cranes
d) Desert National Park – Mugger Crocodile

Answer: c) Tal Chhapar Wildlife Sanctuary – Blackbuck and Demoiselle Cranes

Explanation: Tal Chhapar (7.19 sq km, Churu) is the best-known stronghold for blackbuck in India and hosts migratory demoiselle cranes every winter. Mukundra Hills is a tiger reserve (not a lion habitat — Asiatic lions are extinct in Rajasthan, and no cheetahs have been introduced there either). Mount Abu hosts sambar/muntjac, not cranes. Desert National Park protects the Great Indian Bustard and chinkara, not crocodiles. This sanctuary pairing is a favorite RAS question type.

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3. Lake Sambhar differs from Tal Chhapar in being:

a) Larger in area, hypersaline, and the only one of the two that is a Ramsar Site
b) Smaller in area with freshwater and endemic flora dominance
c) Similar in area but with higher predator populations
d) Designated as a Biosphere Reserve rather than a Ramsar Site

Answer: a) Larger in area, hypersaline, and the only one of the two that is a Ramsar Site

Explanation: Lake Sambhar (240 sq km) is significantly larger than Tal Chhapar (7.19 sq km) and is a hypersaline salt lake (23-50 ppt salinity) vs. Tal Chhapar's freshwater grassland-wetland. Sambhar hosts around 175 bird species including salt-tolerant flamingos and diverse waterfowl, while Tal Chhapar is known for blackbuck and demoiselle cranes. Sambhar was designated a Ramsar Site in 1990 — Tal Chhapar is not a Ramsar site, a common exam trap.

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Sources

Ministry of Environment, Forest & Climate Change; Wildlife Institute of India; Rajasthan Forest Department; Project Tiger / NTCA; IUCN Red List.