A grebe is seen in the Lhalu wetland national nature reserve in Lhasa, southwest China's Tibet Autonomous Region, June 14, 2021. (Photo: Xinhua/Zhang Rufeng)

Grebes are seen in the Lhalu wetland national nature reserve in Lhasa, southwest China's Tibet Autonomous Region, June 14, 2021. (Photo: Xinhua/Zhang Rufeng)

Grebes are seen in the Lhalu wetland national nature reserve in Lhasa, southwest China's Tibet Autonomous Region, June 14, 2021. (Photo: Xinhua/Zhang Rufeng)

Grebes are seen in the Lhalu wetland national nature reserve in Lhasa, southwest China's Tibet Autonomous Region, June 14, 2021. (Photo: Xinhua/Zhang Rufeng)

A grebe is seen in the Lhalu wetland national nature reserve in Lhasa, southwest China's Tibet Autonomous Region, June 14, 2021. (Photo: Xinhua/Zhang Rufeng)

A grebe is seen in the Lhalu wetland national nature reserve in Lhasa, southwest China's Tibet Autonomous Region, June 14, 2021. (Photo: Xinhua/Zhang Rufeng)

Grebes are seen in the Lhalu wetland national nature reserve in Lhasa, southwest China's Tibet Autonomous Region, June 14, 2021. (Photo: Xinhua/Zhang Rufeng)

Two grebe chicks are seen in the Lhalu wetland national nature reserve in Lhasa, southwest China's Tibet Autonomous Region, June 14, 2021. (Photo: Xinhua/Zhang Rufeng)

Grebes are seen in the Lhalu wetland national nature reserve in Lhasa, southwest China's Tibet Autonomous Region, June 14, 2021. (Photo: Xinhua/Zhang Rufeng)