Chiafa, a white Bengal tiger, is pictured at Sofia city zoo, after it opened its doors to the public this week after being closed for over two months amid the outbreak of the coronavirus disease (COVID-19), Bulgaria, May 15, 2020. REUTERS/Stoyan Nenov 

Chiafa, a white Bengal tiger, is pictured at Sofia city zoo, after it opened its doors to the public this week after being closed for over two months amid the outbreak of the coronavirus disease (COVID-19), Bulgaria, May 15, 2020. REUTERS/Stoyan Nenov 

Chiafa, a white Bengal tiger, is pictured at Sofia city zoo, after it opened its doors to the public this week after being closed for over two months amid the outbreak of the coronavirus disease (COVID-19), Bulgaria, May 15, 2020. REUTERS/Stoyan Nenov 

Chiafa, a white Bengal tiger, is pictured at Sofia city zoo, after it opened its doors to the public this week after being closed for over two months amid the outbreak of the coronavirus disease (COVID-19), Bulgaria, May 15, 2020. REUTERS/Stoyan Nenov 

A white tiger is seen in its enclosure at an empty private zoo called "12 Months" in the town of Demydiv, Ukraine May 8, 2020. Picture taken May 8, 2020. A private zoo, which closed its doors to visitors during Ukraine's coronavirus lockdown, has almost run out of money and can barely cover utility bills to maintain conditions for its animals. REUTERS/Gleb Garanich 

Rugby Union - Premiership - Leicester Tigers v Wasps - Welford Road Stadium, Leicester, Britain - February 15, 2020 Leicester Tigers' Ben White in action with Wasps' Zach Kibirige Action Images/Molly Darlington 

Rugby Union - Premiership - Leicester Tigers v Wasps - Welford Road Stadium, Leicester, Britain - February 15, 2020 Leicester Tiger's Ben White in action with Wasps' Zach Kibirige Action Images/Molly Darlington 

U.S. President Donald Trump is presented with a special jersey with his name on it from Joe Burrow of the 2019 NCAA National Championship Football team's Louisiana State University Tigers in the White House in Washington, D.C., U.S., January 17, 2020. REUTERS/Leah Millis 

U.S. President Donald Trump speaks as he welcomes the 2019 NCAA National Championship Football team the Louisiana State University Tigers to the White House in Washington, D.C., U.S., January 17, 2020. REUTERS/Leah Millis 

U.S. President Donald Trump greets Head Coach Ed Orgeron and his wife Kelly as he welcomes the 2019 NCAA National Championship Football team the Louisiana State University Tigers to the White House in Washington, D.C., U.S., January 17, 2020. REUTERS/Leah Millis 

U.S. President Donald Trump speaks as he welcomes the 2019 NCAA National Championship Football team the Louisiana State University Tigers to the White House in Washington, D.C., U.S., January 17, 2020. REUTERS/Leah Millis 

U.S. President Donald Trump greets Head Coach Ed Orgeron and his wife Kelly as he welcomes the 2019 NCAA National Championship Football team the Louisiana State University Tigers to the White House in Washington, D.C., U.S., January 17, 2020. REUTERS/Leah Millis 

U.S. President Donald Trump speaks as he welcomes the 2019 NCAA National Championship Football team the Louisiana State University Tigers to the White House in Washington, D.C., U.S., January 17, 2020. REUTERS/Leah Millis 

U.S. President Donald Trump welcomes the 2019 NCAA National Championship Football team the Louisiana State University Tigers to White House in Washington, D.C., U.S., January 17, 2020. REUTERS/Leah Millis 

U.S. President Donald Trump welcomes the 2019 NCAA National Championship Football team the Louisiana State University Tigers to White House in Washington, D.C., U.S., January 17, 2020. REUTERS/Leah Millis 

U.S. President Donald Trump welcomes the 2019 NCAA National Championship Football team the Louisiana State University Tigers to White House in Washington, D.C., U.S., January 17, 2020. REUTERS/Leah Millis 

Royal white tiger Mumbai is pictured at the Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium August 2, 2019. REUTERS/Yves Herman 

Royal white tiger Mumbai is pictured at the Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium August 2, 2019. REUTERS/Yves Herman 

Royal white tigers, Mumbai and his sister Sanka, are pictured at the Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium August 2, 2019. REUTERS/Yves Herman 

Royal white tigers, Mumbai and his sister Sanka, are pictured at the Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium August 2, 2019. REUTERS/Yves Herman 

Royal white tigers, Mumbai and his sister Sanka, are pictured at the Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium August 2, 2019. REUTERS/Yves Herman 

Royal white tigers, Mumbai and his sister Sanka, are pictured at the Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium August 2, 2019. REUTERS/Yves Herman 

Royal white tigers, Mumbai and his sister Sanka, are pictured at the Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium August 2, 2019. REUTERS/Yves Herman 

Royal white tigers, Mumbai and his sister Sanka, are pictured at the Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium August 2, 2019. REUTERS/Yves Herman 

Royal white tiger Sanka is pictured at the Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium August 2, 2019. REUTERS/Yves Herman 

Royal white tigers, Mumbai and his sister Sanka, are pictured at the Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium August 2, 2019. REUTERS/Yves Herman 

Royal white tiger Sanka is pictured at the Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium August 2, 2019. REUTERS/Yves Herman 

Khan, an eight-year-old male White Bengal tiger, plays inside an open-air cage, as illumination is lit on for late visitors to observe animals at night environment, at the Royev Ruchey zoo in Krasnoyarsk, Russia, July 2, 2019. Picture taken July 2, 2019. REUTERS/Ilya Naymushin 

A litter of white Bengal tiger cubs, who were born in May, is pictured at the White Zoo in Kernhof, Austria June 6, 2019. REUTERS/Leonhard Foeger TPX IMAGES OF THE DAY 

White Bengal tiger cubs are seen at the zoo in Managua, Nicaragua June 5, 2019. Picture taken June 5,2019. REUTERS/Oswaldo Rivas 

White Bengal tiger cubs are seen at the zoo in Managua, Nicaragua June 5, 2019. Picture taken June 5,2019. REUTERS/Oswaldo Rivas 

A white Bengal tiger cub is seen at the zoo in Managua, Nicaragua June 5, 2019. Picture taken June 5,2019. REUTERS/Oswaldo Rivas 

A white Bengal tiger cub is seen at the zoo in Managua, Nicaragua June 5, 2019. Picture taken June 5,2019. REUTERS/Oswaldo Rivas 

White Bengal tiger cubs play at the zoo in Managua, Nicaragua June 5, 2019. Picture taken June 5,2019. REUTERS/Oswaldo Rivas 

A litter of white Bengal tiger cubs, who were born in May, is pictured at the White Zoo in Kernhof, Austria June 6, 2019. REUTERS/Leonhard Foeger 

A litter of white Bengal tiger cubs, who were born in May, is pictured at the White Zoo in Kernhof, Austria June 6, 2019. REUTERS/Leonhard Foeger 

A litter of white Bengal tiger cubs, who were born in May, is pictured at the White Zoo in Kernhof, Austria June 6, 2019. REUTERS/Leonhard Foeger 

A litter of white Bengal tiger cubs, who were born in May, is pictured at the White Zoo in Kernhof, Austria June 6, 2019. REUTERS/Leonhard Foeger 

An emlpoyee holds white Bengal tiger cub, who was born in May, at the White Zoo in Kernhof, Austria June 6, 2019. REUTERS/Leonhard Foeger 

A litter of white Bengal tiger cubs, who were born in May, is pictured at the White Zoo in Kernhof, Austria June 6, 2019. REUTERS/Leonhard Foeger 

An emlpoyee holds white Bengal tiger cub, who was born in May, at the White Zoo in Kernhof, Austria June 6, 2019. REUTERS/Leonhard Foeger 

A white Bengal tiger cub, who was born in May, and its mother Burani are seen at the White Zoo in Kernhof, Austria June 6, 2019. REUTERS/Leonhard Foeger 

A litter of white Bengal tiger cubs, who were born in May, is pictured at the White Zoo in Kernhof, Austria June 6, 2019. REUTERS/Leonhard Foeger 

A white Bengal tiger cub, who was born in May, and its mother Burani are seen at the White Zoo in Kernhof, Austria June 6, 2019. REUTERS/Leonhard Foeger 

A litter of white Bengal tiger cubs, who were born in May, is pictured at the White Zoo in Kernhof, Austria June 6, 2019. REUTERS/Leonhard Foeger 

A white Bengal tiger cub, who was born in May, is pictured at the White Zoo in Kernhof, Austria June 6, 2019. REUTERS/Leonhard Foeger 

A litter of white Bengal tiger cubs, who were born in May, is pictured at the White Zoo in Kernhof, Austria June 6, 2019. REUTERS/Leonhard Foeger 

An emlpoyee holds white Bengal tiger cub, who was born in May, at the White Zoo in Kernhof, Austria June 6, 2019. REUTERS/Leonhard Foeger 

A white tiger is seen at the Saigon Zoo in Ho Chi Minh City, Vietnam June 5, 2019. REUTERS/Yen Duong 

A girl is reflected while looking at white tigers at the Saigon Zoo in Ho Chi Minh City, Vietnam June 5, 2019. REUTERS/Yen Duong 

A white tiger is pictured at the Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium May 29, 2019. REUTERS/Piroschka van de Wouw 

Golfer Tiger Woods is awarded the Presidential Medal of Freedom, the nation's highest civilian honor, by U.S. President Donald Trump in the Rose Garden at the White House in Washington, U.S., May 6, 2019. REUTERS/Clodagh Kilcoyne 

Golfer Tiger Woods is awarded the Presidential Medal of Freedom, the nation's highest civilian honor, by U.S. President Donald Trump in the Rose Garden at the White House in Washington, U.S., May 6, 2019. REUTERS/Clodagh Kilcoyne 

Golfer Tiger Woods is awarded the Presidential Medal of Freedom, the nation's highest civilian honor, by U.S. President Donald Trump in the Rose Garden at the White House in Washington, U.S., May 6, 2019. REUTERS/Clodagh Kilcoyne 

Golfer Tiger Woods is awarded the Presidential Medal of Freedom, the nation's highest civilian honor, by U.S. President Donald Trump in the Rose Garden at the White House in Washington, U.S., May 6, 2019. REUTERS/Clodagh Kilcoyne 

Golfer Tiger Woods is awarded the Presidential Medal of Freedom, the nation's highest civilian honor, by U.S. President Donald Trump in the Rose Garden at the White House in Washington, U.S., May 6, 2019. REUTERS/Clodagh Kilcoyne 

Golfer Tiger Woods is awarded the Presidential Medal of Freedom, the nation's highest civilian honor, by U.S. President Donald Trump in the Rose Garden at the White House in Washington, U.S., May 6, 2019. REUTERS/Clodagh Kilcoyne 

Golfer Tiger Woods is awarded the Presidential Medal of Freedom, the nation's highest civilian honor, by U.S. President Donald Trump in the Rose Garden at the White House in Washington, U.S., May 6, 2019. REUTERS/Clodagh Kilcoyne 

Golfer Tiger Woods is awarded the Presidential Medal of Freedom, the nation's highest civilian honor, by U.S. President Donald Trump in the Rose Garden at the White House in Washington, U.S., May 6, 2019. REUTERS/Clodagh Kilcoyne 

Golfer Tiger Woods is awarded the Presidential Medal of Freedom, the nation's highest civilian honor, by U.S. President Donald Trump in the Rose Garden at the White House in Washington, U.S., May 6, 2019. REUTERS/Clodagh Kilcoyne? TPX IMAGES OF THE DAY