Illuminated flying flamingos are seen during the launch of "Christmas at London Zoo" at ZSL London Zoo, Britain, on Nov. 22, 2018. The "Christmas at London Zoo" is held here from Nov. 22, 2018 to Jan. 1, 2019, during which over one million pea lights, 200 visual displays including giant illuminated animal installations will provide visitors a magical after-dark experience. (Xinhua/Han Yan)

A lion-shaped light installation is seen during the launch of "Christmas at London Zoo" at ZSL London Zoo, Britain, on Nov. 22, 2018. The "Christmas at London Zoo" is held here from Nov. 22, 2018 to Jan. 1, 2019, during which over one million pea lights, 200 visual displays including giant illuminated animal installations will provide visitors a magical after-dark experience. (Xinhua/Han Yan)

A tree made of 365 recycled Christmas sledges is illuminated during the launch of "Christmas at London Zoo" at ZSL London Zoo, Britain, on Nov. 22, 2018. The "Christmas at London Zoo" is held here from Nov. 22, 2018 to Jan. 1, 2019, during which over one million pea lights, 200 visual displays including giant illuminated animal installations will provide visitors a magical after-dark experience. (Xinhua/Han Yan)

A zoo staff poses with a pair of illuminated giant golden giraffes during the launch of "Christmas at London Zoo" at ZSL London Zoo, Britain, on Nov. 22, 2018. The "Christmas at London Zoo" is held here from Nov. 22, 2018 to Jan. 1, 2019, during which over one million pea lights, 200 visual displays including giant illuminated animal installations will provide visitors a magical after-dark experience. (Xinhua/Han Yan)

A zoo staff poses with a lion-shaped light installation during the launch of "Christmas at London Zoo" at ZSL London Zoo, Britain, on Nov. 22, 2018. The "Christmas at London Zoo" is held here from Nov. 22, 2018 to Jan. 1, 2019, during which over one million pea lights, 200 visual displays including giant illuminated animal installations will provide visitors a magical after-dark experience. (Xinhua/Han Yan)

A zoo staff looks at light installations during the launch of "Christmas at London Zoo" at ZSL London Zoo, Britain, on Nov. 22, 2018. The "Christmas at London Zoo" is held here from Nov. 22, 2018 to Jan. 1, 2019, during which over one million pea lights, 200 visual displays including giant illuminated animal installations will provide visitors a magical after-dark experience. (Xinhua/Han Yan)