A boy wearing a face mask visits the Paris Zoological Park in the Bois de Vincennes, Paris, France, June 9, 2020. Paris Zoological Park reopened on Monday after being closed for nearly three months as France eased lockdown measures taken to curb the spread of COVID-19. (Xinhua/Gao Jing)

A mother and her child watch penguins at the Paris Zoological Park in the Bois de Vincennes, Paris, France, June 9, 2020. Paris Zoological Park reopened on Monday after being closed for nearly three months as France eased lockdown measures taken to curb the spread of COVID-19. (Xinhua/Gao Jing)

A staff member wearing a face mask works at the gift shop of Paris Zoological Park in the Bois de Vincennes, Paris, France, June 9, 2020. Paris Zoological Park reopened on Monday after being closed for nearly three months as France eased lockdown measures taken to curb the spread of COVID-19. (Xinhua/Gao Jing)

Children watch sea lions at the Paris Zoological Park in the Bois de Vincennes, Paris, France, June 9, 2020. Paris Zoological Park reopened on Monday after being closed for nearly three months as France eased lockdown measures taken to curb the spread of COVID-19. (Xinhua/Gao Jing)

A little girl plays with geese at the Paris Zoological Park in the Bois de Vincennes, Paris, France, June 9, 2020. Paris Zoological Park reopened on Monday after being closed for nearly three months as France eased lockdown measures taken to curb the spread of COVID-19. (Xinhua/Gao Jing)

A visitor passes by a giraffe at the Paris Zoological Park in the Bois de Vincennes, Paris, France, June 9, 2020. Paris Zoological Park reopened on Monday after being closed for nearly three months as France eased lockdown measures taken to curb the spread of COVID-19. (Xinhua/Gao Jing)

Visitors watch giraffes at the Paris Zoological Park in the Bois de Vincennes, Paris, France, June 9, 2020. Paris Zoological Park reopened on Monday after being closed for nearly three months as France eased lockdown measures taken to curb the spread of COVID-19. (Xinhua/Gao Jing)

A boy watches giraffes at the Paris Zoological Park in the Bois de Vincennes, Paris, France, June 9, 2020. Paris Zoological Park reopened on Monday after being closed for nearly three months as France eased lockdown measures taken to curb the spread of COVID-19. (Xinhua/Gao Jing)