Bags of freshly drawn blood from horses are seen at Clodomiro Picado Institute for a trial to produce a treatment for coronavirus disease (COVID-19), in San Jose, Costa Rica August 3, 2020. Picture taken August 3, 2020. REUTERS/Juan Carlos Ulate

Bags of freshly drawn blood from horses are seen at Clodomiro Picado Institute during a trial to produce a treatment for coronavirus disease (COVID-19), in San Jose, Costa Rica August 3, 2020. Picture taken August 3, 2020. REUTERS/Juan Carlos Ulate

A horse is seen while its blood is drawn into a bag at Clodomiro Picado Institute for a trial to produce a treatment for coronavirus disease (COVID-19), in San Jose, Costa Rica August 3, 2020. Picture taken August 3, 2020. REUTERS/Juan Carlos Ulate

Horses are seen in a corral at Clodomiro Picado Institute, before their blood is drawn for a trial to produce a treatment for coronavirus disease (COVID-19), in San Jose, Costa Rica July 5, 2020. Picture taken July 5, 2020. REUTERS/Juan Carlos Ulate

People ride on a horse-drawn wagon as they pass a mural promoting awareness of the coronavirus disease (COVID-19) outbreak in Jakarta, Indonesia, August 31, 2020. REUTERS/Ajeng Dinar Ulfiana

Women ride in a horse drawn carriage along the promenade following the outbreak of the coronavirus disease (COVID-19) in Blackpool, Britain, August 9, 2020. Picture taken August 9, 2020. REUTERS/Phil Noble

Palestinians ride a horse-drawn cart at an almost empty street during a lockdown after Gaza reported its first cases of the coronavirus disease (COVID-19) in the general population, in Gaza City August 25, 2020. REUTERS/Mohammed Salem

A man rides a horse-drawn cart through a street near a destroyed building in the old City of Mosul, Iraq August 18, 2020. REUTERS/Khalid al-Mousily

A horse drawn carriage containing the casket of U.S. Army Specialist Vanessa Guillen circles the running track at Cesar E. Chavez High School ahead of her memorial and public viewing in Houston, Texas, U.S., August 14, 2020. The remains of Guillen, 20, were discovered in June, months after she disappeared from the Fort Hood military base in Texas. Her family claimed she had been sexually harassed before her disappearance in April, but Army officials say no sexual harassment reports were filed. Guillen was a member of the track team at Chavez. REUTERS/Adrees Latif

A horse drawn carriage containing the casket of U.S. Army Specialist Vanessa Guillen circles Cesar E. Chavez High School ahead of her memorial and public viewing in Houston, Texas, U.S., August 14, 2020. The remains of Guillen, 20, were discovered in June, months after she disappeared from the Fort Hood military base in Texas. Her family claimed she had been sexually harassed before her disappearance in April, but Army officials say no sexual harassment reports were filed. REUTERS/Adrees Latif

Family and friends follow the horse drawn carriage containing the casket of U.S. Army Specialist Vanessa Guillen as it circles the running track at Cesar E. Chavez High School ahead of her memorial and public viewing in Houston, Texas, U.S., August 14, 2020. The remains of Guillen, 20, were discovered in June, months after she disappeared from the Fort Hood military base in Texas. Her family claimed she had been sexually harassed before her disappearance in April, but Army officials say no sexual harassment reports were filed. Guillen was a member of the track team at Chavez. REUTERS/Adrees Latif

A mural of U.S. Army Specialist Vanessa Guillen is seen on the wall of a restaurant as a policeman follows her casket in a horse drawn carriage ahead of her memorial and public viewing in Houston, Texas, U.S., August 14, 2020. The remains of Guillen, 20, were discovered in June, months after she disappeared from the Fort Hood military base in Texas. Her family claimed she had been sexually harassed before her disappearance in April, but Army officials say no sexual harassment reports were filed. REUTERS/Adrees Latif

People ride a horse-drawn carriage in Blackpool, Britain July 31, 2020. REUTERS/Molly Darlington

A military honor guard removes the casket carrying the late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, from a horse-drawn carriage after it was carried across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

The late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, is carried via horse-drawn carriage across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

The late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, is carried via horse-drawn carriage across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

The late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, is carried via horse-drawn carriage across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

The late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, is carried via horse-drawn carriage across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

The late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, is carried via horse-drawn carriage across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

The late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, is carried via horse-drawn carriage across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

The late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, is carried via horse-drawn carriage across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

The casket of late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, is carried via horse-drawn carriage across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage TPX IMAGES OF THE DAY

A military honor guard transfers the casket carrying the late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, from a horse-drawn carriage to a hearse after it was carried across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

The late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, is carried via horse-drawn carriage across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

People watch as a military Honor Guard removes the casket carrying the late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, from a horse-drawn carriage after it was carried across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

People watch as a military honor guard removes the casket carrying the late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, from a horse-drawn carriage after it was carried across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

A military honor guard removes the casket carrying the late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, from a horse-drawn carriage after it was carried across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

An Alabama State Trooper salutes the casket carrying the late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, after it was carried across the Edmund Pettus Bridge in a horse-drawn carriage in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage TPX IMAGES OF THE DAY

An Alabama State Trooper salutes the casket carrying the late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, after it was carried across the Edmund Pettus Bridge in a horse-drawn carriage in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

An Alabama State Trooper salutes the casket carrying the late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, after it was carried via horse-drawn carriage across the Edmund Pettus Bridge in a horse-drawn carriage in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

The late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, is carried via horse-drawn carriage across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

The late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, is carried via horse-drawn carriage across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

The late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, is carried via horse-drawn carriage across the Edmund Pettus Bridge in Selma, Alabama, U.S. July 26, 2020. REUTERS/Elijah Nouvelage

The casket of late U.S. Congressman John Lewis, a pioneer of the civil rights movement and long-time member of the U.S. House of Representatives who died July 17, is carried via horse-drawn carriage from Brown Chapel A.M.E. Church towards the the Edmund Pettus Bridge, in Selma, Alabama, U.S. July 26, 2020. REUTERS/Chris Aluka Berry

A handler of a horse drawn carriage containing an empty coffin is seen during a memorial and a march in the name of Regis Korchinski-Paquet, a Black and Indigenous woman who fell to her death on May 27, 2020, from a balcony as police were present in the apartment, in Toronto, Ontario, Canada July 25, 2020. REUTERS/Chris Helgren

A horse drawn carriage containing an empty coffin is seen during a memorial and a march in the name of Regis Korchinski-Paquet, a Black and Indigenous woman who fell to her death on May 27, 2020, from a balcony as police were present in the apartment, in Toronto, Ontario, Canada July 25, 2020. REUTERS/Chris Helgren

German Chancellor Angela Merkel and Bavarian State Premier Markus Soeder use a horse-drawn carriage as they leave a Bavarian state cabinet meeting at Herrenchiemsee Island, Germany, July 14, 2020. Peter Kneffel/Pool via Reuters

German Chancellor Angela Merkel and Bavarian State Premier Markus Soeder use a horse-drawn carriage as they leave a Bavarian state cabinet meeting at Herrenchiemsee Island, Germany, July 14, 2020. Peter Kneffel/Pool via Reuters

German Chancellor Angela Merkel and Bavarian State Premier Markus Soeder use a horse-drawn carriage on their way to a Bavarian state cabinet meeting at Herrenchiemsee Island, Germany, July 14, 2020. Peter Kneffel/Pool via Reuters

German Chancellor Angela Merkel and Bavarian State Premier Markus Soeder use a horse-drawn carriage on their way to a Bavarian state cabinet meeting at Herrenchiemsee Island, Germany, July 14, 2020. Peter Kneffel/Pool via Reuters

German Chancellor Angela Merkel and Bavarian State Premier Markus Soeder use a horse-drawn carriage on their way to a Bavarian state cabinet meeting at Herrenchiemsee Island, Germany, July 14, 2020. Peter Kneffel/Pool via Reuters

German Chancellor Angela Merkel and Bavarian State Premier Markus Soeder use a horse-drawn carriage on their way to a Bavarian state cabinet meeting at Herrenchiemsee Island, Germany, July 14, 2020. Peter Kneffel/Pool via Reuters

German Chancellor Angela Merkel and Bavarian State Premier Markus Soeder use a horse-drawn carriage on their way to a Bavarian state cabinet meeting at Herrenchiemsee Island, Germany, July 14, 2020. Peter Kneffel/Pool via Reuters

The horse-drawn carriage coffin of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, enters the Houston Memorial Gardens cemetery for his final resting place in Pearland, Texas, U.S., June 9, 2020. REUTERS/Adrees Latif

The horse-drawn carriage coffin of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, enters the Houston Memorial Gardens cemetery for his final resting place in Pearland, Texas, U.S., June 9, 2020. REUTERS/Adrees Latif

The horse-drawn carriage coffin of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, enters the Houston Memorial Gardens cemetery for his final resting place in Pearland, Texas, U.S., June 9, 2020. REUTERS/Adrees Latif

The horse-drawn carriage carrying the casket containing the body of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, is seen on its way to Houston Memorial Gardens cemetery in Pearland, Texas, U.S., June 9, 2020. REUTERS/Carlos Barria

A woman cries as the horse-drawn carriage carrying the casket containing the body of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, passes by, in Pearland, Texas, U.S., June 9, 2020. REUTERS/Carlos Barria

People gather as the horse-drawn carriage carrying the casket containing the body of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, passes by on its way to Houston Memorial Gardens cemetery in Pearland, Texas, U.S., June 9, 2020. REUTERS/Carlos Barria

The horse-drawn carriage coffin of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, arrives for its burial at the Houston Memorial Gardens cemetery in Pearland, Texas, U.S., June 9, 2020. REUTERS/Adrees Latif

Policemen walk ahead of the horse-drawn carriage containing the coffin of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, before his burial at the Houston Memorial Gardens cemetery in Pearland, Texas, U.S., June 9, 2020. REUTERS/Adrees Latif

Policemen on bicycle and on foot walk ahead of the horse-drawn carriage containing the coffin of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, before his burial at the Houston Memorial Gardens cemetery in Pearland, Texas, U.S., June 9, 2020. REUTERS/Adrees Latif

The casket containing the body of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, is seen in a horse-drawn carriage while making its way to Houston Memorial Gardens cemetery in Pearland, Texas, U.S., June 9, 2020. REUTERS/Carlos Barria

People are seen reflected in a horse-drawn carriage carrying the casket containing the body of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, as it makes its way to Houston Memorial Gardens cemetery in Pearland, Texas, U.S., June 9, 2020. REUTERS/Carlos Barria

A row of police officers walk ahead of the horse-drawn carriage coffin of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, before his burial at the Houston Memorial Gardens cemetery in Pearland, Texas, U.S., June 9, 2020. REUTERS/Adrees Latif TPX IMAGES OF THE DAY

A man raises his hand in solidarity as the coffin of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, is seen in a horse-drawn carriage as it enters the Houston Memorial Gardens cemetery in Pearland, Texas, U.S., June 9, 2020. REUTERS/Adrees Latif

The coffin of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, is seen in a horse-drawn carriage as it enters the Houston Memorial Gardens cemetery in Pearland, Texas, U.S., June 9, 2020. REUTERS/Adrees Latif

A man raises his hand in solidarity as the coffin of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, is seen in a horse-drawn carriage as it enters the Houston Memorial Gardens cemetery in Pearland, Texas, U.S., June 9, 2020. REUTERS/Adrees Latif TPX IMAGES OF THE DAY

The horse-drawn carriage carrying the casket containing the body of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, travels to Houston Memorial Gardens cemetery in Pearland, Texas, U.S., June 9, 2020. REUTERS/Goran Tomasevic

The horse-drawn carriage carrying the casket containing the body of George Floyd, whose death in Minneapolis police custody has sparked nationwide protests against racial inequality, travels to Houston Memorial Gardens cemetery in Pearland, Texas, U.S., June 9, 2020. REUTERS/Goran Tomasevic