Cattle, including sheep and goats, graze on the Asy high plateau in Almaty Region, Kazakhstan June 10, 2021. REUTERS/Pavel Mikheyev

Sheep guided by shepherds cross a river on the way to the Asy high plateau in Almaty Region, Kazakhstan June 9, 2021. Picture taken June 9, 2021. REUTERS/Pavel Mikheyev

A shepherd rides a horse while guiding sheep and goats across a river to the Asy high plateau in Almaty Region, Kazakhstan June 9, 2021. Picture taken June 9, 2021. REUTERS/Pavel Mikheyev

A shepherd reacts while guiding goats and sheep across a river to the Asy high plateau in Almaty Region, Kazakhstan June 9, 2021. Picture taken June 9, 2021. REUTERS/Pavel Mikheyev

A shepherd rides a horse while guiding sheep to the Asy high plateau in Almaty Region, Kazakhstan June 9, 2021. Picture taken June 9, 2021. REUTERS/Pavel Mikheyev

A shepherd guides sheep across a river to the Asy high plateau in Almaty Region, Kazakhstan June 9, 2021. Picture taken June 9, 2021. REUTERS/Pavel Mikheyev

Sheep graze near a stone heart-shaped memorial on the Bwlch Mountain, that has been decorated with yellow flags bearing the names of those who died with COVID-19, in Treorchy, Wales, Britain, May 27, 2021. REUTERS/Rebecca Naden

Sheep gaze near a stone heart-shaped memorial on the Bwlch Mountain, that has been decorated with yellow flags bearing the names of those who died with COVID-19, in Treorchy, Wales, Britain, May 27, 2021. REUTERS/Rebecca Naden

Sheep sit under blossom on a tree in Mentmore, near Leighton Buzzard, Britain May 26, 2021. REUTERS/Andrew Boyers

Sheep sit under blossom on a tree in Mentmore, near Leighton Buzzard, Britain May 26, 2021. REUTERS/Andrew Boyers

Khanyisa, an albino elephant calf rescued after being caught in a poaching snare, is seen with Lammie, her companion sheep and surrogate mother, at Hoedspruit Elephant Rehabilitation and Development (HERD) sanctuary, near Hoedspruit, South Africa, May 23, 2021. Picture taken May 23, 2021. REUTERS/ Sumaya Hisham

Khanyisa, an albino elephant calf rescued after being caught in a poaching snare, is seen with Lammie, her companion sheep and surrogate mother, at Hoedspruit Elephant Rehabilitation and Development (HERD) sanctuary, near Hoedspruit, South Africa, May 23, 2021. Picture taken May 23, 2021. REUTERS/ Sumaya Hisham

An instructor of Pasturs Voluntaris programme, or Voluntary Shepherds in the region's Romansh language, stands beside as volunteers fence during a training in the practical skills to help sheep and goat farmers to protect their flocks by keeping wolves away, in Segnas, Switzerland May 22, 2021. Picture taken May 22, 2021. REUTERS/Arnd Wiegmann

Ewes and lambs stand on a pasture during a training of Pasturs Voluntaris programme, or Voluntary Shepherds in the region's Romansh language, in the practical skills to help sheep and goat farmers to protect their flocks by keeping wolves away, in Segnas, Switzerland May 22, 2021. Picture taken May 22, 2021. REUTERS/Arnd Wiegmann

A lamb stands behind an electric protective fence during a training of Pasturs Voluntaris programme, or Voluntary Shepherds in the region's Romansh language, in the practical skills to help sheep and goat farmers to protect their flocks by keeping wolves away, in Segnas, Switzerland May 22, 2021. Picture taken May 22, 2021. REUTERS/Arnd Wiegmann

A lamb stands behind an electric protective fence during a training of Pasturs Voluntaris programme, or Voluntary Shepherds in the region's Romansh language, in the practical skills to help sheep and goat farmers to protect their flocks by keeping wolves away, in Segnas, Switzerland May 22, 2021. Picture taken May 22, 2021. REUTERS/Arnd Wiegmann

Ewes and lambs stand stand behind an electric protective fence during a training of Pasturs Voluntaris programme, or Voluntary Shepherds in the region's Romansh language, in the practical skills to help sheep and goat farmers to protect their flocks by keeping wolves away, in Segnas, Switzerland May 22, 2021. Picture taken May 22, 2021. REUTERS/Arnd Wiegmann

Ewes and lambs stand on a pasture during a training of Pasturs Voluntaris programme, or Voluntary Shepherds in the region's Romansh language, in the practical skills to help sheep and goat farmers to protect their flocks by keeping wolves away, in Segnas, Switzerland May 22, 2021. Picture taken May 22, 2021. REUTERS/Arnd Wiegmann

Marcus Berther, sheep farmer and instructor of Pasturs Voluntaris programme, or Voluntary Shepherds in the region's Romansh language, checks the battery station of an electric fence during a training in the practical skills to help sheep and goat farmers to protect their flocks by keeping wolves away, in Segnas, Switzerland May 22, 2021. Picture taken May 22, 2021. REUTERS/Arnd Wiegmann

An instructor of Pasturs Voluntaris programme, or Voluntary Shepherds in the region's Romansh language, shows volunteers how to fence a meadow during a training in the practical skills to help sheep and goat farmers to protect their flocks by keeping wolves away, in Segnas, Switzerland May 22, 2021. Picture taken May 22, 2021. REUTERS/Arnd Wiegmann

An instructor of Pasturs Voluntaris programme, or Voluntary Shepherds in the region's Romansh language, shows volunteers how to fence a meadow during a training in the practical skills to help sheep and goat farmers to protect their flocks by keeping wolves away, in Segnas, Switzerland May 22, 2021. Picture taken May 22, 2021. REUTERS/Arnd Wiegmann

An instructor of Pasturs Voluntaris programme, or Voluntary Shepherds in the region's Romansh language, shows volunteers how to fence a meadow during a training in the practical skills to help sheep and goat farmers to protect their flocks by keeping wolves away, in Segnas, Switzerland May 22, 2021. Picture taken May 22, 2021. REUTERS/Arnd Wiegmann

A volunteer attaches a plastic ribbon to a fence during a training of the Pasturs Voluntaris programme, or Voluntary Shepherds in the region's Romansh language, in the practical skills to help sheep and goat farmers to protect their flocks by keeping wolves away, in Segnas, Switzerland May 22, 2021. Picture taken May 22, 2021. REUTERS/Arnd Wiegmann

An instructor of the Pasturs Voluntaris programme, or Voluntary Shepherds in the region's Romansh language, shows volunteers how to mow with a scythe during a training in the practical skills to help sheep and goat farmers protect their flocks by keeping wolves away, in Segnas, Switzerland May 22, 2021. Picture taken May 22, 2021. Reuters/Arnd Wiegmann

Patrizio Decurtins, project director of Pasturs Voluntaris, or Voluntary Shepherds in the region's Romansh language, holds a lamb during a training in the practical skills to help sheep and goat farmers to protect their flocks by keeping wolves away, in Segnas, Switzerland May 22, 2021. Picture taken May 22, 2021. REUTERS/Arnd Wiegmann

A Portuguese shepherd wears a protective mask as he guards his sheep and goats in a meadow in Pera in the Algarve region, Portugal, May 12, 2021. REUTERS/Pascal Rossignol

Haven Kiers, an assistant professor of landscape architecture at UC Davis, directs sheep for a landscape pilot project in which the sheep will be used as lawn mowers at the University of California, Davis in Davis, California, U.S. May 5, 2021. Picture taken May 5, 2021. REUTERS/Nathan Frandino

A sheep is seen munching on some grass during a landscaping pilot project at the University of California, Davis in Davis, California, U.S. May 5, 2021. Picture taken May 5, 2021. REUTERS/Nathan Frandino

Sheep graze on a campus lawn for a landscaping pilot project at the University of California, Davis in Davis, California, U.S. May 5, 2021. Picture taken May 5, 2021. REUTERS/Nathan Frandino

Sheep graze on a campus lawn for a landscaping pilot project at the University of California, Davis in Davis, California, U.S. May 5, 2021. Picture taken May 5, 2021. REUTERS/Nathan Frandino

A drone shot shows a group of sheep grazing on a campus lawn at the University of California, Davis in Davis, California, U.S. May 5, 2021. Picture taken May 5, 2021. REUTERS/Nathan Frandino

Sheep graze on a dyke on the North Sea island of Pellworm, Germany May 3, 2021. Picture taken May 3, 2021. REUTERS/Fabian Bimmer

Sheep graze on a dyke on the North Sea island of Pellworm, Germany May 3, 2021. Picture taken May 3, 2021. REUTERS/Fabian Bimmer

Sheep are seen in front of a lighthouse on the North Sea island of Pellworm, Germany May 3, 2021. Picture taken May 3, 2021. REUTERS/Fabian Bimmer

A sheep stands in a tricycle in Yengisar county outside Kashgar, Xinjiang Uyghur Autonomous Region, China, May 2, 2021. Picture taken May 2, 2021. REUTERS/Thomas Peter SEARCH "XINJIANG PETER" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Sheep are gathered at a livestock farm in Tripoli, northern Lebanon April 27, 2021. Picture taken April 27, 2021. REUTERS/Mohamed Azakir

Sheep are gathered at a livestock farm in Tripoli, northern Lebanon April 27, 2021. Picture taken April 27, 2021. REUTERS/Mohamed Azakir

Sheep are gathered at a livestock farm in Tripoli, northern Lebanon April 27, 2021. Picture taken April 27, 2021. REUTERS/Mohamed Azakir

Sheep are gathered at a livestock farm in Tripoli, northern Lebanon April 27, 2021. Picture taken April 27, 2021. REUTERS/Mohamed Azakir

Sheep are seen in a farm near Pergamino, on the outskirts of Buenos Aires during the spread of the coronavirus disease (COVID-19) in Argentina April 27, 2021. REUTERS/Agustin Marcarian

Sheep are seen in a farm near Pergamino, on the outskirts of Buenos Aires during the spread of the coronavirus disease (COVID-19) in Argentina April 27, 2021. REUTERS/Agustin Marcarian

Sheep graze in the background as Britain's Prince William and Catherine, Duchess of Cambridge sit on a hay bale during a visit to Manor Farm in Little Stainton, Durham, Britain April 27, 2021. Owen Humphreys/PA Wire/Pool via REUTERS

Sheep graze as the full moon, known as the "Super Pink Moon", sets behind Stonehenge stone circle near Amesbury, Britain, April 27, 2021. REUTERS/Toby Melville

Sheep graze as the full moon, known as the "Super Pink Moon", sets behind Stonehenge stone circle near Amesbury, Britain, April 27, 2021. REUTERS/Toby Melville

Sheep graze as the full moon, known as the "Super Pink Moon", sets behind Stonehenge stone circle near Amesbury, Britain, April 27, 2021. REUTERS/Toby Melville

Members of the Samaritan sect place skewers of slaughtered sheep into ovens during the traditional Passover sacrifice ceremony, amid the coronavirus disease (COVID-19) outbreak, on Mount Gerizim, near Nablus, in the Israeli-occupied West Bank, April 25, 2021. REUTERS/Raneen Sawafta

Members of the Samaritan sect prepare to slaughter sheep during the traditional Passover sacrifice ceremony, amid the coronavirus disease (COVID-19) outbreak, on Mount Gerizim, near Nablus, in the Israeli-occupied West Bank, April 25, 2021. REUTERS/Raneen Sawafta

Members of the Samaritan sect skin a sheep during the traditional Passover sacrifice ceremony, amid the coronavirus disease (COVID-19) outbreak, on Mount Gerizim, near Nablus, in the Israeli-occupied West Bank, April 25, 2021. REUTERS/Raneen Sawafta

Members of the Samaritan sect prepare to slaughter sheep and goats during the traditional Passover sacrifice ceremony, amid the coronavirus disease (COVID-19) outbreak, on Mount Gerizim, near Nablus, in the Israeli-occupied West Bank, April 25, 2021. REUTERS/Raneen Sawafta

Ding Yinhua, 69, shepherds her sheep and goats back home in the Gobi desert in Minqin county, Wuwei, Gansu province, China, April 18, 2021. Some of the farmers in Wuwei have begun to lose hope after decades trying to subdue the deserts. Despite the tree-planting, pastures have deteriorated in recent years as a result of declining rainfall in the spring and summer, Ding said. "It's just no good without rain. We don't have land so there's no other way: we just herd sheep. In 2015 and 2016, there was rain but since then there's been nothing, and you now have to wait until September," she said. REUTERS/Carlos Garcia Rawlins SEARCH "SAND RAWLINS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

An old family photo placed on a clock is seen at the house of shepherds Ding Yinhua and her husband Li Youfu, in the Gobi desert in Minqin county, Wuwei, Gansu province, China, April 18, 2021. Tree-planting has been at the heart of China's environmental efforts for decades as the country seeks to turn barren deserts and marshes near its borders into farmland but some of the farmers in Wuwei have begun to lose hope after decades trying to subdue the deserts. Despite the tree-planting, pastures have deteriorated in recent years as a result of declining rainfall in the spring and summer, Ding said. "It's just no good without rain. We don't have land so there's no other way: we just herd sheep. In 2015 and 2016, there was rain but since then there's been nothing, and you now have to wait until September," she said. REUTERS/Carlos Garcia Rawlins SEARCH "SAND RAWLINS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Ding Yinhua, 69, a shepherd, kneads dough for next day noodles at her house, in the Gobi desert in Minqin county, Wuwei, Gansu province, China, April 18, 2021. Tree-planting has been at the heart of China's environmental efforts for decades as the country seeks to turn barren deserts and marshes near its borders into farmland but some of the farmers in Wuwei have begun to lose hope after decades trying to subdue the deserts. Despite the tree-planting, pastures have deteriorated in recent years as a result of declining rainfall in the spring and summer, Ding said. "It's just no good without rain. We don't have land so there's no other way: we just herd sheep. In 2015 and 2016, there was rain but since then there's been nothing, and you now have to wait until September," she said. REUTERS/Carlos Garcia Rawlins SEARCH "SAND RAWLINS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Ding Yinhua, 69, a shepherd, opens the gate of a pen for sheep and goats at her house in the Gobi desert in Minqin county, Wuwei, Gansu province, China, April 18, 2021. Tree-planting has been at the heart of China's environmental efforts for decades as the country seeks to turn barren deserts and marshes near its borders into farmland but some of the farmers in Wuwei have begun to lose hope after decades trying to subdue the deserts. Despite the tree-planting, pastures have deteriorated in recent years as a result of declining rainfall in the spring and summer, Ding said. "It's just no good without rain. We don't have land so there's no other way: we just herd sheep. In 2015 and 2016, there was rain but since then there's been nothing, and you now have to wait until September," she said. REUTERS/Carlos Garcia Rawlins SEARCH "SAND RAWLINS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Goats and sheep are seen in a pen outside shepherd Ding Yinhua's house in the Gobi desert in Minqin county, Wuwei, Gansu province, China, April 17, 2021. Picture taken with a drone. Tree-planting has been at the heart of China's environmental efforts for decades as the country seeks to turn barren deserts and marshes near its borders into farmland but some of the farmers in Wuwei have begun to lose hope after decades trying to subdue the deserts. Despite the tree-planting, pastures have deteriorated in recent years as a result of declining rainfall in the spring and summer, Ding said. "It's just no good without rain. We don't have land so there's no other way: we just herd sheep. In 2015 and 2016, there was rain but since then there's been nothing, and you now have to wait until September," she said. REUTERS/Carlos Garcia Rawlins SEARCH "SAND RAWLINS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Puppeteer Basil Twist's sheep are on display before a performance by members of the New York Philharmonic for healthcare workers as part of Lincoln Center's Restart Stages, during the coronavirus disease (COVID-19) pandemic, at Lincoln Center's Hearst Plaza in New York City U.S., April 7, 2021. REUTERS/Brendan McDermid

Puppeteer Basil Twist's sheep are on display before a performance by members of the New York Philharmonic for healthcare workers as part of Lincoln Center's Restart Stages, during the coronavirus disease (COVID-19) pandemic, at Lincoln Center's Hearst Plaza in New York City U.S., April 7, 2021. REUTERS/Brendan McDermid TPX IMAGES OF THE DAY

Puppeteer Basil Twist's sheep are on display before a performance by members of the New York Philharmonic for healthcare workers as part of Lincoln Center's Restart Stages, during the coronavirus disease (COVID-19) pandemic, at Lincoln Center's Hearst Plaza in New York City U.S., April 7, 2021. REUTERS/Brendan McDermid

Puppeteer Basil Twist's sheep are on display before a performance by members of the New York Philharmonic for healthcare workers as part of Lincoln Center's Restart Stages, during the coronavirus disease (COVID-19) pandemic, at Lincoln Center's Hearst Plaza in New York City U.S., April 7, 2021. REUTERS/Brendan McDermid

Puppeteer Basil Twist's sheep are on display before a performance by members of the New York Philharmonic for healthcare workers as part of Lincoln Center's Restart Stages, during the coronavirus disease (COVID-19) pandemic, at Lincoln Center's Hearst Plaza in New York City U.S., April 7, 2021. REUTERS/Brendan McDermid

Sheep graze in Comitancillo, where funeral services for migrants killed in the Mexican state of Tamaulipas while trying to reach the U.S. are held, Guatemala, March 13, 2021. REUTERS/Luis Echeverria