A jungle is land covered with dense vegetation. Application of the term has varied greatly during the last several centuries, both because of this ambiguity in the application of the term and its use in popular culture. Jungles in European and Western literature often represent a less civilised or unruly space outside the control of civilisation because of its association in colonial discourse with places that were colonised by Europeans.
The word jungle originates from the Sanskrit word jangala (Sanskrit: जंगल), meaning uncultivated land. Although the Sanskrit word refers to dry land, it has been suggested that an Anglo-Indian interpretation led to its connotation as a dense "tangled thicket" while others have argued that a cognate word in Urdu did refer to forests. The term is prevalent in many languages of the Indian subcontinent, and the Iranian plateau, where it is commonly used to refer to the plant growth replacing primeval forest or to the unkempt tropical vegetation that takes over abandoned areas.
Because jungles occur on all inhabited landmasses and may incorporate numerous vegetation and land types, the wildlife of jungles can not be defined, and consists of the biota of the constitute land type and region.
As dense and impenetrable vegetation
One of the most common meanings of jungle is land overgrown with tangled vegetation at ground level, especially in the tropics. Typically such vegetation is sufficiently-dense to hinder movement by people, requiring that travelers cut their way through. This definition draws a distinction between rainforest and jungle, since the understorey of rainforests is typically open of vegetation due to a lack of sunlight, and hence relatively easy to traverse. Jungles may exist within, or at the borders of, rainforest in areas where rainforest has been opened through natural disturbance such as hurricanes, or through human activity such as logging. The successional vegetation that springs up following such disturbance of rainforest is dense and impenetrable and is a ‘typical’ jungle. Jungle also typically forms along rainforest margins, such as stream banks, once again due to the greater available light at ground level.
Monsoon forests and mangroves are also commonly referred to as jungles of this type. Having a more open canopy than rainforests, monsoon forests typically have dense understoreys with numerous lianas and shrubs making movement difficult, while the prop roots and low canopies of mangroves produce similar difficulties.
As moist forest
Because European explorers initially travelled through tropical rainforests largely by river, the dense, tangled vegetation lining the stream banks gave a misleading impression that such jungle conditions existed throughout the entire forest. As a result it was wrongly assumed that the entire forest was impenetrable jungle. This in turn appears to have given rise to the second popular usage of jungle as virtually any humid tropical forest. Jungle in this context is particularly associated with tropical rainforest, but may extend to cloud forest, temperate rainforest and mangroves with no reference to the vegetation structure or the ease of travel.
The word "Rainforest" has largely replaced "Jungle" as the descriptor of humid tropical forests, a linguistic transition that has occurred since the 1970s. "Rainforest" itself did not appear in English dictionaries prior to the 1970s. The word "Jungle" accounted for over 80% of the terms used to refer to tropical forests in print media prior to the 1970s, since when it has been steadily replaced by "Rainforest", although "jungle" still remains in common use when referring to tropical rainforests.
As a metaphor, jungle often refers to situations that are unruly or lawless, or where the only law is perceived to be "survival of the fittest". This reflects the view of "city people" that forests are such places. Upton Sinclair gave the title The Jungle (1906) to his famous book about the life of workers at the Chicago Stockyards portraying the workers as being mercilessly exploited with no legal or other lawful recourse.
The term "The Law of the Jungle" is also used in a similar context, drawn from Rudyard Kipling's The Jungle Book (1894) - though in the society of jungle animals portrayed in that book and obviously meant as a metaphor for human society, that phrase referred to an intricate code of laws which Kipling describes in detail, and not at all to a lawless chaos.
The word "jungle" itself carries connotations of untamed and uncontrollable nature and isolation from civilisation, along with the emotions that evokes: threat, confusion, powerlessness, disorientation and immobilisation. The change from "jungle" to "rainforest" as the preferred term for describing tropical forests as has been a response to an increasing perception of these forests as fragile and spiritual places, a viewpoint not in keeping with the darker connotations of "jungle".
Cultural scholars, especially post-colonial critics, often analyse the jungle within the concept of hierarchical domination and the demand western cultures often places on other cultures to conform to their standards of civilisation. For example: Edward Said notes that the Tarzan depicted by Johnny Weissmuller as a resident of the jungle representing the savage, untamed and wild yet still a white master of it; and in his essay "An Image of Africa" about Heart of Darkness African novelist and theorist Chinua Achebe notes how the jungle and Africa become the source of temptation for white European characters like Marlowe and Kurtz.
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