1/17/2024 0 Comments Javan rhinoceros rangeThe horn is pure keratin, like human fingernails, and starts to show after about six years. The Indian rhino's single horn is present in both bulls and cows, but not on newborn calves. In captive animals, the horn is frequently worn down to a thick knob. The nasal horn is slightly back-curved with a base of about 18.5 cm (7.3 in) by 12 cm (4.7 in) that rapidly narrows until a smooth, even stem part begins about 55 mm (2.2 in) above base. The skull is heavy with a basal length above 60 cm (24 in) and an occiput above 19 cm (7.5 in). They have very little body hair, aside from eyelashes, ear fringes and tail brush. Their upper legs and shoulders are covered in wart-like bumps. Indian rhinos have a thick grey-brown skin with pinkish skin folds and one horn on their snout. Characteristics Wart-like bumps on the hind legs The Indian rhinoceros's single horn The skull of an Indian rhinoceros The Sumatran rhino may have diverged from the other Asian rhinos as long as 15 million years ago. Other studies have suggested the Sumatran rhinoceros is more closely related to the two African species. A detailed cladistic analysis of the Rhinocerotidae placed Rhinoceros and the extinct Punjabitherium in a clade with Dicerorhinus, the Sumatran rhinoceros. Different studies have hypothesised that they may be closely related to the extinct Gaindatherium or Punjabitherium. Although belonging to the type genus, the Indian and Javan rhinoceroses are not believed to be closely related to other rhino species. Molecular estimates suggest the species may have diverged much earlier, around 11.7 million years ago. The Indian rhinoceros is known from Early Pleistocene localities in Java, South China, India and Pakistan. The Indian and Javan rhinoceroses, the only members of the genus Rhinoceros, first appear in the fossil record in Asia during the Early Pleistocene. Into the Holocene, some rhinoceros lived as far west as Gujarat and Pakistan until as recently as 3,200 years ago. In the Pleistocene, the genus Rhinoceros ranged throughout South and Southeast Asia, with specimens located on Sri Lanka. unicornis appear in the Middle Pleistocene. The extant family, the Rhinocerotidae, first appeared in the Late Eocene in Eurasia, and the ancestors of the extant rhino species dispersed from Asia beginning in the Miocene. Mitochondrial DNA comparison suggests the ancestors of modern rhinos split from the ancestors of Equidae around 50 million years ago. Several specimens were described since the end of the 18th century under different scientific names, which are all considered synonyms of Rhinoceros unicornis today: Īncestral rhinoceroses first diverged from other perissodactyls in the Early Eocene. As type locality, he indicated Africa and India. Rhinoceros unicornis was the scientific name used by Carl Linnaeus in 1758 who described a rhinoceros with one horn. The Latin word ūnicornis means "one-horned". The generic name Rhinoceros is a combination of the ancient Greek words ῥίς ( ris) meaning "nose" and κέρας ( keras) meaning "horn of an animal". Nearly 85% of the global Indian rhinoceros population is concentrated in Assam, where Kaziranga National Park contains 70% of rhino population. However, poaching remains a continuous threat, as more than 150 Indian rhinos were killed in Assam by poachers between 20. Since then, numbers have increased due to conservation measures taken by the government. In the early 1990s, between 1,870 and 1,895 Indian rhinos were estimated to have been alive. Indian rhinos once ranged throughout the entire stretch of the Indo-Gangetic Plain, but excessive hunting and agricultural development reduced its range drastically to 11 sites in northern India and southern Nepal. Pobitora Wildlife Sanctuary in Assam has the highest density of Indian rhinos in the world with 84 individuals in an area of 38.80 km 2 (14.98 sq mi) in 2009. Kaziranga National Park alone had an estimated population of 2,048 rhinos in 2009. As of August 2018, the global population was estimated to comprise 3,588 individuals, including 2,939 individuals in India and 649 in Nepal. Moreover, the extent and quality of the rhino's most important habitat, the alluvial Terai-Duar savanna and grasslands and riverine forest, is considered to be in decline due to human and livestock encroachment. It is listed as Vulnerable on the IUCN Red List, as populations are fragmented and restricted to less than 20,000 km 2 (7,700 sq mi). The Indian rhinoceros ( Rhinoceros unicornis), or Indian rhino for short, also known as the greater one-horned rhinoceros or great Indian rhinoceros, is a rhinoceros species native to the Indian subcontinent.
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