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They work for the survival of rhino in the world
Currently only five species of rhinoceros, which still survive, with a low population, all rhino species are threatened with extinction. Scarcity of these animals due to poaching for its horn.
Rhino population figures. Source
There are two subspecies of white rhino: the southern white rhinoceros (Ceratotherium simum simum) and the northern white rhinoceros (Ceratotherium simum cottoni). Habitat in the African continent. Having two horns, and the larger front horn.
Northern white rhinoceros
Angalifu, male Northern White Rhinoceros at San Diego Wild Animal Park. Source
Black rhinoceros (Diceros bicornis) habitat in the African continent, two-horned, divided among four species.
Black rhinoceros charging. Source
Black rhinoceros, flehmen response. Source
The Indian rhinoceros, or greater one-horned rhinoceros, (Rhinoceros unicornis). This rhino habitat is in India and the surrounding area, even once inhabited the area of Pakistan, Burma, perhaps even in the Chinese territory.
Indian rhinoceros covered in mud, with mynah birds (Acridotheres sp) along back. Source
A female Indian rhinoceros with her calf photographed at Fort Worth Zoo in Texas. Source
The Javan rhinoceros (Rhinoceros sondaicus) is a one-horned rhino, became one of the most endangered rhino. It is estimated that in 2015 only 60 were left.
Javan Rhino. Source
The population in Ujung Kulon National Park represents the only hope for the survival of a species that is on the brink of extinction. Source
The Sumatran rhinoceros (Dicerorhinus sumatrensis) is the smallest species of all types of rhino. About 275 Sumatran rhinos are believed to remain. The Sumatran rhinoceros, is divided into three subspecies.
Sumatran Rhino. Source
Sumatran Rhino. Source
Sumatran rhinoceros habitat figures. Source
Reference:
https://en.wikipedia.org/wiki/Rhinoceros