A Humboldt penguin swims in a pool during the annual stock take at ZSL London Zoo in London, Thursday, January 2, 2020. Caring for more than 500 different species, ZSL London Zoo's keepers face the challenging task of tallying up every animal large and small, every mammal, bird, reptile, fish and invertebrate at the Zoo. (Photo by Frank Augstein/AP Photo)

A reveler gets ready to perform at a carnival parade in Havana, Cuba August 7, 2015. (Photo by Alexandre Meneghini/Reuters)

Singer Rihanna prepares for a photoshoot with photographer Annie Leibovitz in Havana, Cuba, May 28, 2015. (Photo by Reuters/Stringer)

Vitali Klitschko of Ukraine poses in front of Odlanier Solis of Cuba during the weigh in at Sport Karstadt on March 18, 2011 in Cologne, Germany. The WBC World Championship Heavyweight fight between Vitali Klitschko of Ukraine and Odlanier Solis of Cuba will be held on 19 March 2011.

Melissa March, 13, is seen backstage during the Cuban Otaku festival in Havana, Cuba, July 24, 2016. (Photo by Alexandre Meneghini/Reuters)

A woman works at the H. Upmann cigar factory during the XX Habanos Festival in Havana, Cuba on March 1, 2018. From the field to the factory during the annual Habanos cigar festival in Cuba. (Photo by Reuters/Stringer)

Soldiers march to mark the Armed Forces Day and commemorate the landing of the yacht Granma, which brought the Castro brothers, Ernesto “Che” Guevara and others from Mexico to Cuba to start the revolution in 1959, in Havana, Cuba, January 2, 2017. (Photo by Alexandre Meneghini/Reuters)

Revellers chat on Havana's Malecon seafront before performing at a carnival parade, Cuba, August 12, 2016. (Photo by Alexandre Meneghini/Reuters)