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Mammals - Critically Endangered

(a) Pygmy Hog (Porcula salvania)

  • Is the world's smallest wild pig, with adults weighing only 8 kgs. This species constructs a nest throughout the year.
  • It is one of the most useful indicators of the management status of grassland habitats. The grasslands where the pygmy hog resides are crucial for the survival of other endangered species such as Indian Rhinoceros, Swamp Deer, Wild Buffalo, Hispid Hare, Bengal Florican and Swamp Francolin.
  • In 1996, a captive-breeding programme of the species was initiated in Assam, and some hogs were reintroduced in Sonai Rupai area in 2009.
  • Habitat: Relatively undisturbed, tall 'terai' grasslands.
  • Distribution: Formerly, the species was more widely distributed along the southern Himalayan foothills but now is restricted to only a single remnant population in Manas Wildlife Sanctuary and its buffer reserves.
  • Pygmy hog-sucking Louse (Haematopinus Oliveri), a parasite that feeds only on Pygmy Hogs will also fall in the same risk category as critically endangered survival that of the host species.
  • Threats: The main threats are loss and degradation of grasslands, dry-season burning, livestock grazing and afforestation of grasslands. Hunting is also a threat to remnant populations.

(b) Andaman White-toothed Shrew (Crocidura andamanensis), Jenkin's Andaman Spiny Shrew

  • (Crocidura jenkinsi) and the Nicobar White-tailed Shrew (Crocidura nicobarica) Endemic to India.
  • They are usually active by twilight or in the night and have specialized habitat requirements.
  • Habitat: Leaf litter and rock crevices.
  • Distribution:
    (i) The Andaman White-toothed Shrew is found on Mount Harriet in the South Andaman Islands.
    (ii) The Jenkin's Andaman Spiny Shrew is found on Wright Myo and Mount Harriet in the South Andaman Islands.
  • The Nicobar White-tailed Shrew (Crocidura nicobarica) is found in Greater Nicobar Island's southern tip and is also recorded in the area extending from the Campbell Bay National Park to the Galathea River in the Andaman and Nicobar Islands.
  • Threats: Habitat loss due to selective logging, natural disasters such as the tsunami and drastic weather changes.

(c) Kondana Rat (Millardia kondana)

  • It is a nocturnal burrowing rodent that is found only in India. It is sometimes known to build nests.
  • Habitat: Tropical and subtropical dry deciduous forests and tropical scrub.
  • Distribution: Known only from the small Sinhagarh Plateau (about one km²), near Pune in Maharashtra. Reported from an elevation of about 1,270 m above mean sea level.
  • Threats: Major threats are habitat loss, overgrazing of vegetation and disturbance from tourism and recreational activities.

(d) The Large Rock Rat or Elvira Rat (Cremnomys elvira)

  • It is a medium-sized, nocturnal and burrowing rodent endemic to India.
  • Habitat: Tropical dry deciduous shrubland forest, seen in rocky areas.
  • Habitat/distribution: Known only from Eastern Ghats of Tamil Nadu. Recorded from an elevation of about 600 m above mean sea level.
  • Threats: Major threats are habitat loss, conversion of forests and fuelwood collection.

(e) The Namdapha Flying Squirrel (Biswamoyopterus biswasi)

  • It is a unique (the only one in its genus) flying squirrel restricted to a single valley in the Namdapha N.P. (or) W.L.S. in Arunachal Pradesh.
  • Habitat: Tropical forest.
  • Habitat/distribution: Found only in Namdapha Tiger Reserve in Arunachal Pradesh.
  • Threats: Hunted for food.

(f) The Malabar Civet (Viverra civettina)

  • It is considered to be one of the world's rarest mammals.
  • It is endemic to India and was first reported from Travancore, Kerala.
  • It is nocturnal in nature and found exclusively in the Western Ghats.
  • Habitat: Wooded plains and hill slopes of evergreen rainforests.
  • Habitat/distribution: Western Ghats.
  • Threats: Deforestation and commercial plantations are major threats.

(g) The Sumatran Rhinoceros (Dicerorhinus sumatrensis)

  • It is the smallest and most endangered of the five rhinoceros species.
  • It is now thought to be regionally extinct in India, though it once occurred in the Himalayas and north-east India's foothills.
  • The Javan Rhinoceros (Rhinoceros sondaicus) is also believed to be extinct in India, and only a small number survive in Java and Vietnam.

(h) Kashmir stag/ hangul (Cervus elaphus hanglu)

  • It subspecies of Red Deer which is native to India.
  • Habitat/distribution - in dense riverine forests, high valleys, and mountains of the Kashmir valley and northern Chamba in Himachal Pradesh.
  • State animal of J&k.
  • Threat - habitat destruction, over-grazing by domestic livestock, and poaching.

Marine Mammals

(a) Freshwater/river dolphin

Habitat/distribution - India, Bangladesh, Nepal and Pakistan which is split into two subspecies, the Ganges river dolphin and Indus river dolphin.

(b) Ganges river dolphin

  • Habitat/distribution - Ganges and Brahmaputra Rivers and their tributaries in Bangladesh, India and Nepal.
  • The government of India has recognized the Ganges river dolphin as its National Aquatic Animal.

(c) Indus river dolphin
Habitat/distribution - Indus River in Pakistan and its Beas and Sutlej tributaries.

(d) Herbivorous Marine Mammals
include dugong and manatees, and they inhabit swamps, rivers, estuaries, marine wetlands, and coastal marine waters.

(e) Dugong

  • (Dugong dugon) also called a sea cow.
  • Stat us - vulnerable. Threat - hunting (meat and oil), habitat degradation, and fishing-related fatalities.

(f) Manatees

  • Habitat/distribution - the Caribbean Sea, Gulf of Mexico, the Amazon Basin, and West Africa
  • Threat - coastal development, red tide, hunting.

Few Exceptions

(a) Egg Laying Mammals
Monotremes' unique feature, a subdivision of mammal, is that monotremes lay eggs rather than giving birth to their young. There are only five living Monotreme/ egg-laying Mammals species: the duck-billed platypus and four species of spiny anteaters (also known as echidna). All of them are found only in Australia and New Guinea.

  • Echidnas are also known as spiny anteaters.
    (i) Habitat / distribution - Australia and New Guinea
    (ii) In echidnas, the egg is carried in a pouch on the female's belly until the young hatches, at which point the barely developed young must find a mammary gland and latch onto it for nourishment. 
  • Platypus is a semi-aquatic mammal.
    (i) Habitat / distribution - endemic to eastern Australia, including Tasmania.
    (ii) In the platypus, the female retires to a burrow in the bank of a river or pond. The burrow is lined with dry vegetation, and there the eggs are laid.
    (iii) The male platypus has venom strong enough to kill a small dog, or cause excruciating pain among humans.

(b) Marsupials

  • Marsupials are commonly thought of as pouched mammals (like the wallaby and kangaroo).
  • Marsupial mammals have a placenta, but it is very shortlived and does not contribute to fetal nourishment.
  • They give birth very early and the young animal, essentially a helpless embryo, climbs from the mother's birth canal to the nipples.
  • There it grabs on with its mouth and continues to develop, often for weeks or months depending on the species.
  • They do not have long gestation times like placental mammals. The short gestation time is due to having a yolk-type placenta in the mother marsupial.
  • Extinct - Marsupial - quagga, the marsupial wolf.
  • Placental mammals all bear live young, nourished before birth in the mother's uterus through a specialized embryonic organ attached to the uterus wall, the placenta.
  • Placental mammals nourish the developing embryo using the mother's blood supply, allowing longer gestation times.

Birds - Critically Endangered

(a) The Jerdon's Courser

  • It is a nocturnal bird found only in the northern part of Andhra Pradesh in peninsular India.
  • It is a flagship species for the extremely threatened scrub jungle.
  • The species was considered extinct until it was rediscovered in 1986 and the area of rediscovery was subsequently declared as the Sri Lankamaleswara Wildlife Sanctuary.
  • Habitat: Undisturbed scrub jungle with open areas.
  • Distribution: Jerdon's Courser is endemic to Andhra Pradesh.
  • Threats: Clearing of scrub jungle, creating new pastures, growing of dryland crops, Illegal trapping of birds, plantations of exotic trees, quarrying and the construction of the River Canals.

(b) The Forest Owlet

  • Had been lost for more than a century. After 113 long years, the owlet was rediscovered in 1997 and reappeared on Indian birds.
  • Habitat: Dry deciduous forest.
  • Habitat/distribution: South Madhya Pradesh, in northwest Maharashtra and north-central Maharashtra.
  • Threats: Logging operations, burning and cutting trees damage roosting and nesting trees of the Forest Owlet.

(c) The White-bellied Heron

  • scarce bird found in five or six sites in Assam and Arunachal Pradesh, one or two sites in Bhutan, and a few in Myanmar.
  • Habitat: Rivers with sand or gravel bars or inland lakes.
  • Distribution: Bhutan and north-east India to the hills of Bangladesh and north Myanmar.
  • Threats: Loss and degradation of lowland forests and wetlands through direct exploitation and disturbance by humans.

(d) The Bengal Florican

  • A rare bustard species that is very well known for its mating dance. Among the tall grasslands, secretive males advertise their territories by springing from the ground and flitting to and fro in the air.
  • Habitat: Grasslands occasionally interspersed with scrublands.
  • Distribution: Native to only 3 countries in the world - Cambodia, India and Nepal. In India, it occurs in 3 states, namely Uttar Pradesh, Assam and Arunachal Pradesh.
  • Threats: Ongoing conversion of the bird's grassland habitat for various purposes including agriculture is mainly responsible for its population decline.

(e) The Himalayan Quail

  • It is presumed to be extinct since no reliable records of sightings of this species exist after 1876. Intensive surveys are required as this species is hard to detect due to its reluctance to fly and its preference for dense grass habitats. Possible sighting of this species was reported in Nainital in 2003.
  • Habitat: Tall grass and scrub on steep hillsides.
  • Distribution: Western Himalayas.
  • Threats: Indiscriminate hunting during the colonial period along with habitat modification.

(f) Pink-headed Duck

  • It has not been conclusively recorded in India since 1949. Males have a deep pink head and neck from which the bird derives its name.
  • Habitat: Overgrown still-water pools, marshes and swamps in lowland forests and tall grasslands.
  • Distribution: Recorded in India, Bangladesh and Myanmar. Maximum records are from north-east India.
  • Threats: Wetland degradation and loss of habitat and hunting are the main causes of its decline.

(g) Sociable Lapwing (Vanellus gregarious)

  • It is a winter migrant to India. This species has suffered a sudden and rapid population decline due to which it has been listed as critically endangered.
  • Habitat: Fallow fields and scrub desert.
  • Distribution: Central Asia, Asia Minor, Russia, Egypt, India, Pakistan. In India, habitat/distribution is restricted to the north and northwest of the country.
  • Threats: Conversion of habitat to arable land, illegal hunting and proximity to human settlements

(h) Spoon Billed Sandpiper

  • It requires highly specialized breeding habitat, a constraint that has always kept its population scarce. India is home to some of the last existing wintering grounds of this species.
  • Habitat: Coastal areas with sparse vegetation. No breeding records further inland than 7 km from the seashore.
  • Distribution: Has been recorded in West Bengal, Orissa, Kerala and Tamil Nadu.
  • Threats: Habitat degradation and land reclamation. Human disturbance also leads to a high incidence of nest desertion.

(i) Siberian Crane

  • It is a large, strikingly majestic migratory bird that breeds and winters in wetlands. They are known to winter at Keoladeo National Park, Rajasthan. However, the last documented sighting of the bird was in 2002.
  • Habitat: Wetland areas.
  • Located distribution: Keoladeo National Park in Rajasthan.
  • Threats: Pesticide pollution, wetland drainage, development of prime habitat into agricultural fields, and to some extent, hunting.

Corals

➤ Fire corals

  • They are more closely related to jellyfish than corals. On contact, one usually feels a burning sensation similar to a sting from a jellyfish.
  • Habitat: Generally found in murky inshore waters and display tolerance for siltation. They often are found in clear offshore sites.
  • Distribution: Indonesia, Gulf of Chiriquí, Panama Pacific Province. Possibly extinct from Australia, India, Indonesia, Malaysia, Panama, Singapore and Thailand.
  • Threats: Collected for decoration and jewellery trade. This group is also sensitive to temperature rise and has completely disappeared from most marine areas, possibly because of growing global warming-related bleaching effects.

Bird's Migration

Migration refers to the regular, recurrent and cyclical seasonal movement of birds from one place to other. The distance of migration ranged from short distance to thousands of kilometres. But at the end of the period, birds will eventually return to the original place.

(a) Reasons for migration

  • To avoid adverse factors (extreme climatic condition) 
  • To manage food shortage
  • To manage the shortage of water
  • To have better breeding conditions 
  • Less competition for safe nesting places

(b) Migratory birds of India
Animal Diversity Of India | Environment for UPSC CSE

Wildlife Diseases

Animal Diversity Of India | Environment for UPSC CSE

Species Extinction

  • Various processes cause extinction:
    (i) Deterministic processes that have a cause and effect. E.g. glaciations, human interference such as deforestation.
    (ii) Stochastic processes (chance and random events) affect the survival and reproduction of individuals. E.g. unexpected changes in weather patterns decreased food supply, disease, increase of competitors, predators or parasites, etc. that may act independently or add to deterministic effects. 
  • The impact of these processes will depend on the size and degree of genetic diversity and resilience of populations.
  • Traits that adversely affect or increase a species vulnerability to extinction due to habitat fragmentation have been identified. These are:
    (i) rarity or low abundance
    (ii) poor dispersal ability
    (iii) ecological specialization
    (iv) unstable populations
  • high trophic status – as animals occupying a higher trophic level (i.e. the position of a species in a food chain) usually have smaller populations than those at lower levels (e.g. carnivores are fewer in number than herbivores)
  • low adult survival rates
  • low intrinsic rate population increase
  • Body size, fecundity, dietary specialization.

(a) Natural extinctions

  • Have been caused due to several factors:
    (i) continent drifting,
    (ii) climate change,
    (iii) tectonic activity
    (iv) increased volcanic activity
    (v) The late Ordovician global glaciations (439 Mya).
    (vi) The late Cretaceous extinction assumed to be associated with an extra-terrestrial impact.
  • Extinction in vascular plants has been more gradual compared with the loss of animals. It is believed that extinction among this group was due more to competitive displacement by more advanced plant forms or a gradual climate change than any sudden catastrophic event.

(b) Artificial Extinction

  • Even though species extinction is a natural process that can happen without humans' intervention, extinctions caused by humans are now happening over and above the reasonable estimate of natural extinction rates.
  • Species are threatened with extinction by the intervention of humans due to:
    (i) direct causes – such as hunting, collection or capture and persecution
    (ii) Indirect causes – such as habitat loss, modification and fragmentation, and invasive species' introduction. 

Man - Animal Conflict

It refers to the interaction between wild animals and people and the resultant negative impact on people or their resources, wild animals, or habitat. It occurs when wildlife needs overlap with those of human populations, creating costs to residents and wild animals.

(a) Causes

  • Human population growth
  • Land use transformation
  • Species habitat loss, degradation and fragmentation
  • Increasing livestock populations and competitive exclusion of wild herbivores
  • The growing interest in ecotourism and increasing access to nature reserves
  • Abundance and distribution of wild prey
  • Increasing wildlife population as a result of conservation programmes
  • Climatic factors
  • Stochastic events (e.g. fire)

(b) Impacts

  • Crop damage
  • Livestock depredation
  • Injuries to people
  • Loss of human life
  • Damage to property
  • Injuries to wildlife
  • Animal deaths
  • Destruction of habitat

(c) Preventive strategies

  • Artificial and natural barriers (physical and biological)
  • Guarding
  • Alternative high-cost livestock husbandry practices
  • Relocation: voluntary human population resettlement
  • Waste management systems that restrict wildlife access to refuse

(d) Mitigative strategies

  • Compensation systems
  • Insurance programmes
  • Incentive programmes
  • Community-based natural resource management schemes (CBNRMS)
  • Regulated harvest
  • Increase alternate crops prey or water points
  • Wildlife translocation
  • Conservation education for local populations
  • Better sharing of information.
The document Animal Diversity Of India | Environment for UPSC CSE is a part of the UPSC Course Environment for UPSC CSE.
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FAQs on Animal Diversity Of India - Environment for UPSC CSE

1. What are some examples of critically endangered mammals?
Ans. Some examples of critically endangered mammals include the Sumatran orangutan, Javan rhinoceros, Amur leopard, and Hawaiian monk seal.
2. How do marine mammals differ from other mammals?
Ans. Marine mammals are specially adapted to living in aquatic environments. They have streamlined bodies, flippers or fins for swimming, and can hold their breath for extended periods of time.
3. Why are birds critically endangered?
Ans. Birds can become critically endangered due to habitat loss, pollution, climate change, hunting, and the introduction of invasive species. These factors can disrupt their breeding and feeding patterns, leading to population decline.
4. What role do corals play in marine ecosystems?
Ans. Corals are important for marine ecosystems as they provide habitats for a wide variety of marine species. They also contribute to the formation of coral reefs, which protect coastlines from erosion and provide a source of food for many marine organisms.
5. How do wildlife diseases contribute to species extinction?
Ans. Wildlife diseases can have devastating effects on animal populations, leading to high mortality rates and reduced reproductive success. When a species is already threatened or has a small population size, the introduction of a disease can easily push it towards extinction.
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