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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 humans, requiring that travelers cut their way through.This definition draws a distinction between primary forest and jungle, since the under-storey of tropical forests 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, tropical forests in areas where the forest 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 forest margins and along stream banks, once again due to the greater available light at ground level.
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