Senin, 25 Juni 2012

Rhinoceros



The Biggest Animals Kingdom and in The World | Rhinoceros | Rhinoceros, often abbreviated as rhino, is a group of five extant species of knee-less, odd-toed ungulates in the family Rhinocerotidae. Two of these species are native to Africa and three to southern Asia. The horns are made of keratin, the same type of protein that makes up hair and fingernails. Both African species and the Sumatran rhinoceros have two horns, while the Indian and Javan rhinoceros have a single horn.


The word rhinoceros is derived through Latin from the Ancient Greek, which is composed  (rhino-, "nose") and κέρας (keras, "horn"). The plural in English is rhinoceros or rhinoceroses. The collective noun for a group of rhinoceroses is crash or herd. The five living species fall into three categories. The two African species, the white rhinoceros and the black rhinoceros, diverged during the early Pliocene (about 5 million years ago) but the Dicerotini group to which they belong originated in the middle Miocene, about 14.2 million years ago. The main difference between black and white rhinos is the shape of their mouths.
 
White rhinos have broad flat lips for grazing and black rhinos have long pointed lips for eating foliage White rhinoceros are divided into northern and southern subspecies. There are two living Rhinocerotini species, the Indian rhinoceros and the Javan rhinoceros, which diverged from one another about 10 million years ago.  Interspecific hybridisation of black and white rhinoceros has also been confirmed

Kinds Of Rhino :

White rhinoceros
Black rhinoceros
Indian rhinoceros
Javan rhinoceros
Sumatran rhinoceros



This small hornless ancestor resembled a tapir or small horse more than a rhino. The smallest hyracodontids were dog-sized; the largest was Indricotherium, believed to be one of the largest land mammals that ever existed.  The family Amynodontidae, also known as "aquatic rhinos", dispersed across North America and Eurasia, from the late Eocene to early Oligocene.  The family of all the modern rhinoceros, the Rhinocerotidae, first appeared in the Late Eocene in Eurasia Also known as the giant rhinoceros, Elasmotherium was two meters tall, five meters long and weighed around five tons, with a single enormous horn, hypsodont teeth and long legs for running.


Of the extant rhinoceros species, the Sumatran rhino is the most archaic, first emerging more than 15 million years ago. The Sumatran rhino was closely related to the woolly rhinoceros, but not to the other modern species. The Indian rhino and Javan rhino are closely related and from a more recent lineage of Asian rhino.

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