Local residents enjoy themselves in a river in the Tamanthi Wildlife Sanctuary of Sagaing in north Myanmar, May 30, 2019. In Sagaing, many local residents live by the riverside and keep a traditional lifestyle. (Xinhua/Jin Liwang)

Local residents renovate a boat in the Tamanthi Wildlife Sanctuary of Sagaing in north Myanmar, May 25, 2019. In Sagaing, many local residents live by the riverside and keep a traditional lifestyle. (Xinhua/Jin Liwang)

Boatmen rest in a tent in the Tamanthi Wildlife Sanctuary of Sagaing in north Myanmar, May 31, 2019. In Sagaing, many local residents live by the riverside and keep a traditional lifestyle. (Xinhua/Jin Liwang)

Boatmen catch mayflies in a traditional way before rainfall in the Tamanthi Wildlife Sanctuary of Sagaing in north Myanmar, May 23, 2019. In Sagaing, many local residents live by the riverside and keep a traditional lifestyle. (Xinhua/Jin Liwang)

A local resident prepares to eat betel nut in the Tamanthi Wildlife Sanctuary of Sagaing in north Myanmar, May 24, 2019. In Sagaing, many local residents live by the riverside and keep a traditional lifestyle. (Xinhua/Jin Liwang)

A local resident prepares to cook soup with various medical herbs to alleviate exhaustion in the Tamanthi Wildlife Sanctuary of Sagaing in north Myanmar, May 27, 2019. In Sagaing, many local residents live by the riverside and keep a traditional lifestyle. (Xinhua/Jin Liwang)

Boatmen catch mayflies in a traditional way before rainfall in the Tamanthi Wildlife Sanctuary of Sagaing in north Myanmar, May 23, 2019. In Sagaing, many local residents live by the riverside and keep a traditional lifestyle. (Xinhua/Jin Liwang)

A local guide tries to destroy a hornet's nest in the Tamanthi Wildlife Sanctuary of Sagaing in north Myanmar, May 28, 2019. In Sagaing, many local residents live by the riverside and keep a traditional lifestyle. (Xinhua/Jin Liwang)