An alpine chough perches on one of the blue sheep foraging near the Mount Qomolangma base camp in southwest China's Tibet Autonomous Region on May 8, 2020. (Xinhua/Jigme Dorje)

A flock of blue sheep forage near the Mount Qomolangma base camp in southwest China's Tibet Autonomous Region on May 8, 2020. (Xinhua/Purbu Zhaxi)

An alpine chough perches on one of the blue sheep foraging near the Mount Qomolangma base camp in southwest China's Tibet Autonomous Region on May 8, 2020. (Xinhua/Purbu Zhaxi)

An alpine chough feeds on a blue sheep foraging near the Mount Qomolangma base camp in southwest China's Tibet Autonomous Region on May 8, 2020. (Xinhua/Purbu Zhaxi)