The one-minute spot shows Chan, a UNICEF Goodwill Ambassador, with six children and some very colourful origami birds that are used to convey an essential message.

该一分钟插播告示显示儿童基金会亲善大使成龙与6名儿童和一些色彩绚丽的纸鸟在一起，他们被用于传达一个极其重要的信息。

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He thinks the threat of bird strikes to the vulnerable engines of passenger jets will make it essential for the birds to be relocated or even killed - safety will require it.

BBC: Jobs or birds: Turning Rio rhetoric into reality

It is an essential part of managing the land - and is controlled by a strict code and within a window of time before birds start to nest.

BBC: 'If you drop a match, it just goes'