Wildlife groups have welcomed the news as a sign that political involvement and innovative conservation strategies can reverse the decline of the majestic Royal Bengal tiger. 

A survey carried out earlier this year counted 235 tigers in Nepal, up from around 121 in 2009.

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Conservationists and wildlife experts used more than 4,000 cameras and around 600 elephants, trawling a 2,700-kilometre (1,700-mile) route across Nepal's southern plains where the big cats roam.

"This is a result of concentrated unified efforts by the government along with the local community and other stakeholders to protect the tiger's habitat and fight against poaching," Man Bahadur Khadka, director general of Nepal's Department of National Parks and Wildlife Conservation, told AFP.

Deforestation, encroachment of habitat and poaching have devastated big cat numbers across Asia, but in 2010 Nepal and 12 other countries signed a pledge to double their tiger numbers by 2022.

The 2010 Tiger Conservation Plan -- which is backed by high profile figures including actor Leonardo DiCaprio -- quickly began bearing fruit, and in 2016 the World Wildlife Fund and the Global Tiger Forum announced that the wild tiger population had increased for the first time in more than a century.

In 1900, more than 100,000 tigers roamed the world but that fell to an all-time low of 3,200 in 2010.

DiCaprio tweeted his support for Nepal's success: "I am proud of @dicapriofdn's partnership with @World_Wildlife to support Nepal and local communities in doubling the population of wild tigers."

Read also: Villagers fear tiger invasion after prints found

Ghana Gurung, country representative of WWF in Nepal, said the country's progress was an example for tiger conservation globally. 

"The challenge now is to continue these efforts to protect their habitats and numbers for the long-term survival of the tigers," he said.

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