One-Horned Rhino UPSC
The one-horned rhinoceros, also known as the Indian rhinoceros (Rhinoceros unicornis), is a species of rhinoceros native to the Indian subcontinent. They have a single horn on the snout, which distinguishes them from African rhinoceros species that typically have two horns.
They are primarily found in the tall grasslands and forests in the northern part of the Indian subcontinent, specifically in Nepal, Bhutan, India, and Bangladesh. Kaziranga National Park in India has been a stronghold for the Indian rhinoceros.
The one-horned rhinoceros is listed as vulnerable on the International Union for Conservation of Nature (IUCN) Red List. The one-horned rhino has faced threats from habitat loss, human-wildlife conflict, and poaching for its horn.
Conservation efforts have been implemented to protect these rhinos and their habitats, and there have been some successful programs, particularly in India and Nepal.
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One-Horned Rhino Characteristics
The one-horned rhinoceros possesses several distinctive characteristics that make it a unique and fascinating species. Here are some key features:
1. Classification:
The one-horned rhinoceros belongs to the following classification:
- Kingdom: Animalia
- Phylum: Chordata
- Subphylum: Vertebrata
- Class: Mammalia
- Order: Perissodactyla
- Family: Rhinocerotidae
- Genus: Rhinoceros
- Species: R. unicornis
2. Scientific Name:
The scientific name of the one-horned rhinoceros is Rhinoceros unicornis.
3. Species:
There are five recognized species of rhinoceros and Greater One Horned Rhino (Indian Rhino) is one of them. Each species has its own unique characteristics and is found in specific regions of Africa and Asia. Here are the five rhino species:
(i). White Rhinoceros:
- There are two subspecies: the Southern white rhinoceros (C. simum simum) and the critically endangered Northern white rhinoceros (C. simum cottoni).
- The Southern white rhinoceros is the most numerous rhino species and is primarily found in southern Africa.
(ii). Black Rhino:
- Black rhinos are known for their hooked upper lip and are distributed across various regions of Africa.
- Smaller of the two African species.
(iii). Greater One Horned Rhino (Indian Rhino):
- Found in the Indian subcontinent, primarily in India and Nepal.
- It has one horn and distinctive skin folds.
(iv). Sumatran Rhino (Dicerorhinus sumatrensis):
- Found on the islands of Sumatra and Borneo in Southeast Asia.
- It is the smallest rhino species and is critically endangered.
(v). Javan Rhino: (Rhinoceros sondaicus):
- Found in Java, Indonesia.
- It is one of the rarest large mammals and is critically endangered.
4. Habitat:
The One-Horned Rhinoceros is primarily found in the grasslands, savannas, and wetlands of the Indian subcontinent. Its habitat includes:
(i) Tall Grasslands: These rhinos are often associated with tall grasslands, where they can graze on the abundant vegetation. The grassy plains provide essential food resources for the rhinos.
(ii) Savannas: They inhabit savanna areas, characterized by a mix of grasses and scattered trees. The open landscape allows for ease of movement and foraging.
(iii) Forests: The One-Horned Rhino can also be found in forested areas, including moist and dry deciduous forests. These habitats offer additional food sources and provide cover.
(iv) Riverine and Swampy Areas: The rhinos are commonly found near rivers and in swampy areas. These locations serve as essential water sources for drinking and bathing.
(v) Human-Modified Landscapes: In some regions, these rhinos have adapted to human-modified landscapes, including areas with agricultural activities.
5. Physical Appearance:
The Greater One-Horned Rhinoceros is characterized by distinctive physical features that contribute to its unique appearance. Here are key aspects of the One-Horned Rhino's physical appearance:
(i) Single Horn:
The most obvious characteristic is the presence of one horn, although some individuals may have a second, smaller horn. This horn is made of keratin, the same protein that makes up human hair and nails.
(ii) Size and Weight:
One-horned rhinos are large, robust animals. Adult males typically weigh between 2,000 to 2,300 kg (4,400 to 5,000 lbs), while females are somewhat smaller, weighing between 1,600 to 1,800 kg (3,500 to 4,000 lbs).
- Size- Head and body length: 368–380 cm (12.07–12.47 ft)
- Shoulder height- 163–193 cm (5.35–6.33 ft)
(iii) Thick Skin Folds:
The rhino's skin is thick and gray-brown in color, with prominent folds and rivet-like bumps, giving it an armored appearance. This thick skin provides some protection against predators and environmental hazards.
(iv) Prehensile Upper Lip:
One-horned rhinos have a prehensile upper lip that helps them grasp and pull grass into their mouths. This adaptation is especially useful for feeding on grasses in their natural habitats.
(v) Distinctive Hump:
A distinctive hump on the back of the neck, particularly noticeable in older males, adds to the rhino's unique profile.
(vi) Limbs:
Thick and stocky legs support the rhino's massive body. They have three toes on each foot.
(vii) Tail:
The tail is relatively short and ends with a tuft of hair at the tip.
6. Diet:
The Greater One-Horned Rhinoceros is primarily a herbivore, and its diet consists mainly of plant matter. Here are key aspects of the One-Horned Rhino's diet:
(i) Grasses:
Grass forms a significant portion of the rhino's diet. They graze on a variety of grass species in their natural habitats.
(ii) Browsing:
In addition to grasses, One-Horned Rhinos may engage in browsing, feeding on leaves, twigs, and other non-grassy vegetation. Fruits, such as those from the Ficus religiosa tree, are also part of their diet. This behavior is often observed in forested areas where grass may be less abundant.
(iii) Water Intake:
While the One-Horned Rhino can derive a significant portion of its water requirement from the moisture content of the vegetation it consumes, they also need to drink water regularly. They are often found near rivers and swampy areas, where they can access water.
(iv) Feeding Patterns:
One-Horned Rhinos are known to be crepuscular, meaning they are more active during dawn and dusk. They may rest and avoid feeding during the hotter parts of the day.
(v) Efficient Digestive System:
Rhinos have a relatively simple stomach, but their large size allows for a longer retention time of food in the digestive tract, aiding in the extraction of nutrients.
7. Behavior:
The behavior of the Indian rhinoceros (Greater One-Horned Rhinoceros) encompasses various aspects of their daily activities, social interactions, and adaptations to their environment. Here are key points about the behavior of Indian rhinos:
(i) Solitary Nature:
Indian rhinos are generally solitary animals, with the exception of females with calves and during the mating season. Adult males, in particular, tend to be solitary and territorial.
(ii) Territorial Behavior:
Adult males establish territories, marking them with urine and dung. They may engage in territorial displays and conflicts with other males to defend their territory.
(iii) Social Structure:
While primarily solitary, there may be loose aggregations of rhinos in areas with abundant resources, such as waterholes or grazing grounds.
(iv) Mating Behavior:
During the mating season, male rhinos actively seek out females. Mating pairs may form, but the association is typically temporary.
(v) Communication:
Indian rhinos produce a wide variety of vocalizations, including snorting, honking, bleating, roaring, squeak-panting, moo-grunting, shrieking, groaning, rumbling, and humphing. These vocalizations serve various communication purposes.
(vi) Crepuscular Activity:
Indian rhinos are crepuscular, meaning they are more active during dawn and dusk. They may rest in shaded areas during the heat of the day.
(vii) Bathing and Mud-Wallowing:
Indian rhinos are known to enjoy bathing and mud-wallowing. This behavior helps them cool down, reduce the risk of parasites, and protect their skin from the sun.
(viii) Swimming and Running Abilities:
Indian rhinos are excellent swimmers and can run at speeds of up to 55 km/h (34 mph) for short bursts. This ability likely aids them in escaping threats or navigating through their habitat.
(ix) Sensory Abilities:
They have excellent senses of hearing and smell, which play a crucial role in their communication and detecting potential dangers. However, their eyesight is relatively poor.
(x) Interactions in Aggregations:
In aggregations, Indian rhinos often exhibit friendly behaviors, including greeting each other by waving or bobbing their heads, mounting flanks, nuzzling noses, or licking. Playful activities, such as sparring, running, and playing with twigs, are observed.
(xi) Aggressive Defense:
When threatened, Indian rhinos can be aggressive and may charge. They have a well-developed sense of hearing and smell, allowing them to detect potential threats. Adult bulls are primary instigators in fights, which can be aggressive and sometimes result in mortality. Bull aggression is also directed toward females during courtship, involving long chases and face-to-face attacks.
(xii) Use of Horns in Fighting:
Indian rhinos use their horns for fighting, although less frequently than African rhinos. African rhinos often use the incisors of the lower jaw for inflicting wounds during fights.
Note- Mynahs and egrets both eat invertebrates from the rhino's skin and around its feet. Tabanus flies, a type of horse-fly, are known to bite rhinos.