African elephant calves, which were born at Africam Safari zoo as part of its breeding programme, are seen with their mothers at their enclosure, in Valsequillo, Mexico August 12, 2020. REUTERS/Imelda Medina

African elephant calves, which were born at Africam Safari zoo as part of its breeding programme, are seen with their mothers at their enclosure, in Valsequillo, Mexico August 12, 2020. REUTERS/Imelda Medina

African elephant calves, which were born at Africam Safari zoo as part of its breeding programme, are seen at their enclosure, in Valsequillo, Mexico August 12, 2020. REUTERS/Imelda Medina

African elephant calves, which were born at Africam Safari zoo as part of its breeding programme, are seen at their enclosure, in Valsequillo, Mexico August 12, 2020. REUTERS/Imelda Medina

Alfred Brandt and his son, Sam Brandt, 8, look at their Holstein calves on the dairy farm that's been in their family since 1840 and been affected by the industry's supply chain disruptions created by the coronavirus disease (COVID-19), in Linn, Missouri, U.S. April 28, 2020. Brandt, along with other U.S. dairy farmers, has seen a drop in milk prices and has been forced to dump excess milk as a result of the closure of schools, restaurants and coffee shops. REUTERS/Whitney Curtis

Holstein calves are seen at Alfred Brandt's dairy farm, which has been in his family since 1840 and has been affected by the industry's supply chain disruptions created by the coronavirus disease (COVID-19), in Linn, Missouri, U.S. April 28, 2020. Brandt, along with other U.S. dairy farmers, has seen a drop in milk prices and has been forced to dump excess milk as a result of the closure of schools, restaurants and coffee shops. REUTERS/Whitney Curtis

Calves stand together in their shed at a farm in Be'er Tuvia, southern Israel February 5, 2020. Picture taken February 5, 2020. REUTERS/Amir Cohen

A labourer and Israeli farmer Guy Golan tend to calves in their shed at his farm in Be'er Tuvia, southern Israel February 5, 2020. Picture taken February 5, 2020. REUTERS/Amir Cohen

A labourer feeds calves in their shed at a farm in Be'er Tuvia, southern Israel February 5, 2020. Picture taken February 5, 2020. REUTERS/Amir Cohen

Calves stand together in their shed at a farm in Be'er Tuvia, southern Israel February 5, 2020. Picture taken February 5, 2020. REUTERS/Amir Cohen

Calves stand together in their shed at a farm in Be'er Tuvia, southern Israel February 5, 2020. Picture taken February 5, 2020. REUTERS/Amir Cohen

The remaining calves belonging to dairy farmer Tim Salway stand on his farm in Wandella, as smoke from the bushfires blankets the area near the town of Cobargo, New South Wales, Australia, January 13, 2020. REUTERS/Alkis Konstantinidis SEARCH "COBARGO BUSHFIRE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

A few of the remaining calves of dairy farmer Tim Salway are seen in his farm in Wandella, near the town of Cobargo, Australia January 13, 2020. Most of Salway's farm was destroyed including storage facilities, fences and hundreds of cattle. Picture taken January 13, 2020. REUTERS/Alkis Konstantinidis

The remaining calves of dairy farmer Tim Salway drink water at his farm in Wandella, near the town of Cobargo, Australia January 13, 2020. Most of Salway's farm was destroyed including storage facilities, fences and hundreds of cattle. Picture taken January 13, 2020. REUTERS/Alkis Konstantinidis

Dairy farmer and former local mayor of the Bega Valley Shire, Tony Allen, stands next to calves at his farm in the town of Cobargo, Australia January 13, 2020. Picture taken January 13, 2020. REUTERS/Alkis Konstantinidis

Calves are seen at the farm of dairy farmer and former local mayor of the Bega Valley Shire, Tony Allen, in the town of Cobargo, Australia January 13, 2020. Picture taken January 13, 2020. REUTERS/Alkis Konstantinidis

A destroyed storage facility is seen in front of the remaining calves of dairy farmer Tim Salway in his farm in Wandella, near the town of Cobargo, Australia January 13, 2020. Most of Salway's farm was destroyed including storage facilities, fences and hundreds of cattle. Picture taken January 13, 2020. REUTERS/Alkis Konstantinidis

Paul Giese, feeds some newly acquired dairy calves at the family farm, God Green Acres in Mayville, Wisconsin, U.S., June 24, 2019. Picture taken June 24, 2019. REUTERS/Darren Hauck

Gordon A. Giese, 66, and his son Paul Giese get ready to feed baby calves at the family farm, God Green Acres in Mayville, Wisconsin, U.S., June 24, 2019. Picture taken June 24, 2019. REUTERS/Darren Hauck

Calves rest in a field in front of houses in Sullens near Lausanne, Switzerland April 30 2019. REUTERS/Denis Balibouse

Calves rest in a field in front of houses in Sullens near Lausanne, Switzerland April 30 2019. REUTERS/Denis Balibouse

Calves are seen in a stable at a ranch as the Caribbean nation endures its worst drought in 30 years, in Santiago Rodriguez, Dominican Republic March 16, 2019. Picture taken March 16, 2019. REUTERS/Ricardo Rojas

Veterinarian Jean-Marie Surer anaesthetises calves before removing their horns, ahead of a national vote on the horned cow initiative (Hornkuh-Initiative) on November 25, at a farm in Marchissy, Switzerland, November 15, 2018. Picture taken November 15, 2018. REUTERS/Denis Balibouse

Three cows stand in the summer heat at the recently closed Cottrell Homestead dairy farm in West Kingston, Rhode Island, U.S., 14 July 2018. The Cottrell Homestead at its peak was home to over 80 cows. Today, the farm houses less than 20, some of which are just being boarded there by their owners. They milk what they need to feed the calves, and dump the rest. REUTERS/Oliver Doyle SEARCH "USA DAIRY" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Ocean water is pushed up by the bottom of a pinnacle iceberg as it falls back during a large calving event at the Helheim glacier near Tasiilaq, Greenland, June 22, 2018. REUTERS/Lucas Jackson

A large crevasse forms near the calving front of the Helheim glacier near Tasiilaq, Greenland, June 22, 2018. REUTERS/Lucas Jackson

Tabular icebergs float in the Sermilik Fjord after a large calving event at the Helheim glacier near Tasiilaq, Greenland, June 23, 2018. REUTERS/Lucas Jackson

Tabular icebergs float in the Sermilik Fjord after a large calving event at the Helheim glacier near Tasiilaq, Greenland, June 23, 2018. REUTERS/Lucas Jackson

A large crevasse forms near the calving front of the Helheim glacier near Tasiilaq, Greenland, June 22, 2018. REUTERS/Lucas Jackson SEARCH "JACKSON GREENLAND" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Tabular icebergs float in the Sermilik Fjord after a large calving event at the Helheim glacier near Tasiilaq, Greenland, June 23, 2018. REUTERS/Lucas Jackson SEARCH "JACKSON GREENLAND" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Tabular icebergs float in the Sermilik Fjord after a large calving event at the Helheim glacier near Tasiilaq, Greenland, June 23, 2018. This portion between the glacier front and the open ocean is known as the "melange" and is filled with ice, snow and icebergs packed together on their way to a fjord and later the ocean. REUTERS/Lucas Jackson SEARCH "JACKSON GREENLAND" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY

Perched on a cliff above Greenland's Helheim glacier, I tried calling my wife in New York on a satellite phone. Before I could leave a message, an explosion broke the arctic silence. More explosions followed. I ran across a muddy tundra to a video camera on a tripod overlooking the glacier and ripped off the trash bag I had used to protect it. I hit record as fast as I could focus. The popping sounds morphed into a low rumble. Over the next half hour, the ice broke apart and a four-mile wide chunk tumbled into the sea in a process called calving - one rarely witnessed on this scale. REUTERS/Lucas Jackson SEARCH "JACKSON GREENLAND" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY Matching text: CLIMATECHANGE-GREENLAND/ TPX IMAGES OF THE DAY

A calf stands next to plastic rubbish in Cox's Bazar, Bangladesh, March 23, 2018. Picture taken March 23, 2018. REUTERS/Clodagh Kilcoyne

A dairy cow cleans her newly born calf on a dairy farm in Saint-Valerien-de-Milton, southeast of Montreal, Quebec, Canada, August 30, 2018. REUTERS/Christinne Muschi

Palestinian boys look at calves displayed for sale at a livestock market ahead of the Eid al-Adha festival, in Khan Younis in the southern Gaza Strip August 19, 2018. Picture taken August 19, 2018. REUTERS/Ibraheem Abu Mustafa

A farmer feeds calves in a barn at a dairy farm in South Mountain, Ontario, Canada, June 29, 2018. REUTERS/Chris Wattie

Calves stand in a barn at a dairy farm in South Mountain, Ontario, Canada, June 29, 2018. REUTERS/Chris Wattie

A dead calf is seen at an area affected by the eruption of the Fuego volcano at El Rodeo in Escuintla, Guatemala June 6, 2018. REUTERS/Carlos Jasso TPX IMAGES OF THE DAY

Two calves are seen at the Balukhali camp near Cox's Bazar, Bangladesh December 11, 2017. REUTERS/Alkis Konstantinidis

Calves look on in a milk farm on the outskirts of Libertad city, Uruguay, June 8, 2017. REUTERS/Andres Stapff

The one trillion tonne iceberg, measuring 5,800 square km, calved away from the Larsen C Ice Shelf in Antarctica sometime between July 10 and 12, scientists said.

UPDATE Shows latest extent of the rift. Map showing the rift in the Larsen C ice shelf that led to the calving of an iceberg on the Antarctic Peninsula.

A rhino and its calf walk through the grass of Nairobi National Park near Nairobi, Kenya May 12, 2017. REUTERS/Baz Ratner

Map of Antarctica locating the extent of the crack on the Larsen C ice shelf.

A calf killed by wildfires lies in a burned pasture near Higgins, Texas, U.S., March 12, 2017. REUTERS/Lucas Jackson SEARCH "HIGGINS WILDFIRE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY

A pile of calves lie in a pit with cattle killed by wildfires before being buried near Laverne, Oklahoma, U.S., March 12, 2017. REUTERS/Lucas Jackson SEARCH "HIGGINS WILDFIRE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A woman bottle feeds a calf whose mother had died, at the Agropil ranch in Boqueron, Paraguay, August 14, 2016. REUTERS/Jorge Adorno SEARCH "BOQUERON DROUGHT" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A woman bottle feeds a calf whose mother had died, at the Agropil ranch in Boqueron, Paraguay, August 14, 2016. REUTERS/Jorge Adorno SEARCH "BOQUERON DROUGHT" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

Activists stand on the street with placards during a protest against the use of animals in food, clothing production and circuses, in Ciudad Juarez, Mexico, August 27, 2016. The placards read (L-R) "Adopt, sterilize, Don't abandon them", "The milk is for my calves", "We also feel". REUTERS/Jose Luis Gonzalez

Activists stands on the street with placards during a protest against the use of animals in food, clothing production and circuses, in Ciudad Juarez, Mexico, August 27, 2016. The placard (R) reads "The milk is for my calves". REUTERS/Jose Luis Gonzalez

Tanda, a 23 year-old white rhinoceros and her week-old calf stand in their enclosure at the Ramat Gan Safari Zoo near Tel Aviv, Israel August 25, 2016. REUTERS/Baz Ratner

Tanda, a 23 year-old white rhinoceros and her week-old calf stand in their enclosure at the Ramat Gan Safari Zoo near Tel Aviv, Israel August 25, 2016. REUTERS/Baz Ratner

Tanda, a 23 year-old white rhinoceros and her week-old calf stand in their enclosure at the Ramat Gan Safari Zoo near Tel Aviv, Israel August 25, 2016. REUTERS/Baz Ratner

Ryle Smith of Oakdale, California, flips a calf in the tie-down roping event during the Calgary Stampede rodeo in Calgary, Alberta, Canada July 8, 2016. REUTERS/Todd Korol

Former mayor of Valencia, Rita Barbera arrives at court to testify in the Noos case, in which Spain's Princess Cristina stands accused of tax fraud in Palma de Mallorca, Spain, April 12, 2016. REUTERS/Enrique Calv

Camel calves rest next to a field near the southern Israeli town of Rahat March 21, 2016. REUTERS/Baz Ratner

Camel calves rest next to a field near the southern Israeli town of Rahat March 21, 2016. REUTERS/Baz Ratner

Camel calves rest next to a field near the southern Israeli town of Rahat March 21, 2016. REUTERS/Baz Ratner

Camel calves rest next to a field near the southern Israeli town of Rahat March 21, 2016. REUTERS/Baz Ratner

Calves are pictured outside the European Union agriculture ministers meeting as farmers protest against low selling prices in central Brussels, Belgium March 14, 2016. REUTERS/Francois Lenoir