British naturalist Sir David Attenborough gives autographs during the naming ceremony for the new polar research ship at Cammell Laird shipyard in Birkenhead, Britain, September 26, 2019. REUTERS/Phil Noble

Britain's Prince William with Catherine, Duchess of Cambridge and naturalist Sir David Attenborough attend the naming ceremony for the new polar research ship at Cammell Laird shipyard in Birkenhead, Britain, September 26, 2019. REUTERS/Phil Noble

Britain's Catherine, Duchess of Cambridge and naturalist Sir David Attenborough attend the naming ceremony for the new polar research ship at Cammell Laird shipyard in Birkenhead, Britain, September 26, 2019. REUTERS/Phil Noble

Britain's Prince William and Catherine, Duchess of Cambridge and naturalist Sir David Attenborough attend the naming ceremony for the new polar research ship at Cammell Laird shipyard in Birkenhead, Britain, September 26, 2019. REUTERS/Phil Noble

Britain's Prince William and Catherine, Duchess of Cambridge and naturalist Sir David Attenborough attend the naming ceremony for the new polar research ship at Cammell Laird shipyard in Birkenhead, Britain, September 26, 2019. REUTERS/Phil Noble

Britain's Prince William and Catherine, Duchess of Cambridge and naturalist Sir David Attenborough attend the naming ceremony for the new polar research ship at Cammell Laird shipyard in Birkenhead, Britain, September 26, 2019. REUTERS/Phil Noble

British naturalist Sir David Attenborough arrives at Cammell Laird shipyard to attend the naming ceremony for the new polar research ship in Birkenhead, Britain, September 26, 2019. REUTERS/Phil Noble

British naturalist Sir David Attenborough arrives at Cammell Laird shipyard to attend the naming ceremony for the new polar research ship in Birkenhead, Britain, September 26, 2019. REUTERS/Phil Noble

Britain's Prince Harry, Prince Charles, Prince William and British naturalist David Attenborough attend the global premiere of Netflix's "Our Planet" at the Natural History Museum in London, Britain April 4, 2019. REUTERS/John Sibley/Pool

British naturalist David Attenborough gives a speech during the global premiere of Netflix's "Our Planet" at the Natural History Museum in London, Britain April 4, 2019. REUTERS/John Sibley/Pool

British naturalist David Attenborough attends the global premiere of Netflix's "Our Planet" at the Natural History Museum in London, Britain April 4, 2019. REUTERS/John Sibley/Pool

Britain's Prince Harry talks with British naturalist David Attenborough during the global premiere of Netflix's "Our Planet" at the Natural History Museum in London, Britain April 4, 2019. REUTERS/John Sibley/Pool

British naturalist David Attenborough gives a speech during the global premiere of Netflix's "Our Planet" at the Natural History Museum in London, Britain April 4, 2019. REUTERS/John Sibley/Pool

Britain's Prince Harry, Prince William, Prince Charles and British naturalist David Attenborough attend the global premiere of Netflix's "Our Planet" at the Natural History Museum in London, Britain April 4, 2019. REUTERS/John Sibley/Pool

British naturalist David Attenborough gives a speech during the global premiere of Netflix's "Our Planet" at the Natural History Museum in London, Britain April 4, 2019. REUTERS/John Sibley/Pool

British naturalist David Attenborough gives a speech during the global premiere of Netflix's "Our Planet" at the Natural History Museum in London, Britain April 4, 2019. REUTERS/John Sibley/Pool

Britain's Prince Harry, Prince William, Prince Charles and British naturalist David Attenborough attend the global premiere of Netflix's "Our Planet" at the Natural History Museum in London, Britain April 4, 2019. REUTERS/John Sibley/Pool

Britain's Prince Harry, Prince William, Prince Charles and British naturalist David Attenborough attend the global premiere of Netflix's "Our Planet" at the Natural History Museum in London, Britain April 4, 2019. REUTERS/John Sibley/Pool

Britain's Prince Harry talks with British naturalist David Attenborough during the global premiere of Netflix's "Our Planet" at the Natural History Museum in London, Britain April 4, 2019. REUTERS/John Sibley/Pool

Britain's Prince Harry, Prince Charles, Prince William and British naturalist David Attenborough attend the global premiere of Netflix's "Our Planet" at the Natural History Museum in London, Britain April 4, 2019. REUTERS/John Sibley/Pool

Britain's Prince Harry, Prince Charles, Prince William and British naturalist David Attenborough attend the global premiere of Netflix's "Our Planet" at the Natural History Museum in London, Britain April 4, 2019. REUTERS/John Sibley/Pool

British naturalist David Attenborough walks before hosting the global premiere of Netflix's "Our Planet" at the Natural History Museum in London, Britain April 4, 2019. REUTERS/John Sibley/Pool

British naturalist David Attenborough gestures before hosting the global premiere of Netflix's "Our Planet" at the Natural History Museum in London, Britain April 4, 2019. REUTERS/John Sibley/Pool

Al Gore, former U.S. Vice President and Climate Reality Project Chairman, naturalist Sir David Attenborough and New Zealand's Prime Minister Jacinda Ardern attend the World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 22, 2019. REUTERS/Arnd Wiegmann

Britain's Prince William, Duke of Cambridge interviews naturalist Sir David Attenborough during the World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 22, 2019. REUTERS/Arnd Wiegmann

Britain's Prince William, Duke of Cambridge and naturalist Sir David Attenborough watch the clip from the documentary series "Our Planet" during the World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 22, 2019. REUTERS/Arnd Wiegmann

Britain's Prince William, Duke of Cambridge interviews naturalist Sir David Attenborough during the World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 22, 2019. REUTERS/Arnd Wiegmann TPX IMAGES OF THE DAY

Britain's Prince William, Duke of Cambridge gestures as he interviews naturalist Sir David Attenborough during the World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 22, 2019. REUTERS/Arnd Wiegmann

Britain's Prince William, Duke of Cambridge gestures as he interviews naturalist Sir David Attenborough during the World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 22, 2019. REUTERS/Arnd Wiegmann

Britain's Prince William, Duke of Cambridge interviews naturalist Sir David Attenborough during the World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 22, 2019. REUTERS/Arnd Wiegmann

Founder and Executive Chairman of the WEF Klaus Schwab, Britain's Prince William, Duke of Cambridge and naturalist Sir David Attenborough attend the World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 22, 2019. REUTERS/Arnd Wiegmann

Britain's Prince William, Duke of Cambridge interviews naturalist Sir David Attenborough during the World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 22, 2019. REUTERS/Arnd Wiegmann

Britain's Prince William, Duke of Cambridge interviews naturalist Sir David Attenborough during the World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 22, 2019. REUTERS/Arnd Wiegmann

Britain's Prince William, Duke of Cambridge interviews naturalist Sir David Attenborough during the World Economic Forum (WEF) annual meeting in Davos, Switzerland, January 22, 2019. REUTERS/Arnd Wiegmann

The Crystal Award laureates U.S. conductor Marin Alsop, Naturalist Sir David Attenborough, and Saudi Arabian director Haifaa al-Mansour pose with Hilde Schwab, Chairperson and Co-Founder of Schwab Foundation for Social Entrepreneurship and Founder and Executive Chairman of the WEF Klaus Schwab during an opening ceremony of the World Economic Forum (WEF) in Davos, Switzerland, January 21, 2019. REUTERS/Arnd Wiegmann

The Crystal Award laureates U.S. conductor Marin Alsop, Naturalist Sir David Attenborough, and Saudi Arabian director Haifaa al-Mansour pose with Hilde Schwab, Chairperson and Co-Founder of Schwab Foundation for Social Entrepreneurship and Founder and Executive Chairman of the WEF Klaus Schwab during an opening ceremony of the World Economic Forum (WEF) in Davos, Switzerland, January 21, 2019. REUTERS/Arnd Wiegmann

The Crystal Award laureates U.S. conductor Marin Alsop, Naturalist Sir David Attenborough, and Saudi Arabian director Haifaa al-Mansour pose with Hilde Schwab, Chairperson and Co-Founder of Schwab Foundation for Social Entrepreneurship and Founder and Executive Chairman of the WEF Klaus Schwab during an opening ceremony of the World Economic Forum (WEF) in Davos, Switzerland, January 21, 2019. REUTERS/Arnd Wiegmann

Naturalist Sir David Attenborough delivers a speech as he receives a Crystal Award, during an opening ceremony of the World Economic Forum (WEF) in Davos, Switzerland, January 21, 2019. REUTERS/Arnd Wiegmann

Naturalist Sir David Attenborough delivers a speech as he receives a Crystal Award, during an opening ceremony of the World Economic Forum (WEF) in Davos, Switzerland, January 21, 2019. REUTERS/Arnd Wiegmann

Naturalist Sir David Attenborough receives a Crystal Award from Hilde Schwab, Chairperson and Co-Founder of Schwab Foundation for Social Entrepreneurship, during an opening ceremony of the World Economic Forum (WEF) in Davos, Switzerland, January 21, 2019. REUTERS/Arnd Wiegmann

Naturalist Sir David Attenborough receives a Crystal Award from Hilde Schwab, Chairperson and Co-Founder of Schwab Foundation for Social Entrepreneurship, during an opening ceremony of the World Economic Forum (WEF) in Davos, Switzerland, January 21, 2019. REUTERS/Arnd Wiegmann

Artist and naturalist Stephanie Barthes adjusts a neon lamp on a stuffed pony as she works on her art creation called "Poney-Licorne" at her workshop in Bordeaux, France, January 8, 2019. REUTERS/Regis Duvignau TPX IMAGES OF THE DAY

A stuffed tiger is pictured at the workshop of artist and naturalist Stephanie Barthes in Bordeaux, France, January 8, 2019. REUTERS/Regis Duvignau

Artist and naturalist Stephanie Barthes adjuts a stuffed baboon as she works on her art creations made with stuffed animals at her workshop in Bordeaux, France, January 8, 2019. REUTERS/Regis Duvignau

Artist and naturalist Stephanie Barthes poses with a stuffed tiger as she works on her art creations made with stuffed animals at her workshop in Bordeaux, France, January 8, 2019. REUTERS/Regis Duvignau

Artist and naturalist Stephanie Barthes inflates a life jacket under a stuffed muskrat as she works on her art creations made with stuffed animals at her workshop in Bordeaux, France, January 8, 2019. REUTERS/Regis Duvignau

Artist and naturalist Stephanie Barthes displays stuffed birds as she works on her art creations made with stuffed animals at her workshop in Bordeaux, France, January 8, 2019. REUTERS/Regis Duvignau

Artist and naturalist Stephanie Barthes adjusts a neon lamp on a stuffed deer as she works on her art creations made with stuffed animal at her workshop in Bordeaux, France, January 8, 2019. REUTERS/Regis Duvignau

Artist and naturalist Stephanie Barthes installs a stuffed lion cub and baboon as she adjusts her art creation "Un roi est ne (A king is born)" made with stuffed animals at her workshop in Bordeaux, France, January 8, 2019. REUTERS/Regis Duvignau

Artist and naturalist Stephanie Barthes paints a stuffed lion as she works on her art creations made with a stuffed animals at her workshop in Bordeaux, France, January 8, 2019. REUTERS/Regis Duvignau

Artist and naturalist Stephanie Barthes adjusts a neon lamp on a stuffed pony as she works on her art creation called "Poney-Licorne" at her workshop in Bordeaux, France, January 8, 2019. REUTERS/Regis Duvignau

Artist and naturalist Stephanie Barthes poses with stuffed pink flamingos as she prepares her art creations made with stuffed animals at her workshop in Bordeaux, France, January 8, 2019. REUTERS/Regis Duvignau

World renowned naturalist Sir David Attenborough sits next to "The People’s Seat” during the opening of COP24 UN Climate Change Conference 2018 in Katowice, Poland December 3, 2018. REUTERS/Kacper Pempel

World renowned naturalist Sir David Attenborough delivers the “People’s Seat” address during the opening of COP24 UN Climate Change Conference 2018 in Katowice, Poland December 3, 2018. REUTERS/Kacper Pempel

World renowned naturalist Sir David Attenborough delivers the “People’s Seat” address during the opening of COP24 UN Climate Change Conference 2018 in Katowice, Poland December 3, 2018. REUTERS/Kacper Pempel

World renowned naturalist Sir David Attenborough delivers the “People’s Seat” address during the opening of COP24 UN Climate Change Conference 2018 in Katowice, Poland December 3, 2018. REUTERS/Kacper Pempel

World renowned naturalist Sir David Attenborough attends the opening of COP24 UN Climate Change Conference 2018 in Katowice, Poland December 3, 2018. REUTERS/Kacper Pempel

British naturalist and broadcaster David Attenborough stands in front of a section of the keel of the new polar research vessel that will carry his name at a ceremony at the Cammell Laird ship yard in Birkenhead, northern England October 17 , 2016. REUTERS/Phil Noble

British broadcaster and naturalist David Attenborough speaks during a service of thanksgiving for Queen Elizabeth's 90th birthday at St Paul's Cathedral in London, Britain, June 10, 2016. REUTERS/Matt Dunham/Pool