Illuminated sign in support of NHS seen at London Zoo(1/7)

An illuminated sign in support of the National Health Service (NHS) is seen as a giraffe looks out from the giraffe house at London Zoo in London, Britain, on April 29, 2020. (Xinhua/Han Yan)

An illuminated sign in support of the National Health Service (NHS) is seen as a giraffe looks out from the giraffe house at London Zoo in London, Britain, on April 29, 2020. (Xinhua/Han Yan)

An illuminated sign in support of the National Health Service (NHS) is seen as two giraffes look out from the giraffe house at London Zoo in London, Britain, on April 29, 2020. (Xinhua/Han Yan)

An illuminated sign in support of the National Health Service (NHS) is seen as two giraffes walk out from the giraffe house at London Zoo in London, Britain, on April 29, 2020. (Xinhua/Han Yan)

An illuminated sign in support of the National Health Service (NHS) is seen as a giraffe walks out from the giraffe house at London Zoo in London, Britain, on April 29, 2020. (Xinhua/Han Yan)

An illuminated sign in support of the National Health Service (NHS) is seen as a giraffe looks out from the giraffe house at London Zoo in London, Britain, on April 29, 2020. (Xinhua/Han Yan)

An illuminated sign in support of the National Health Service (NHS) is seen as a giraffe looks out from the giraffe house at London Zoo in London, Britain, on April 29, 2020. (Xinhua/Han Yan)