In fact this is the the Pellucid Hawkmoth, Cephonodes hylas
This is one of those wonderful insects - a moth - that have been mistaken for tiny hummingbirds. They can get quite large, and the way they fly is exactly like a hummingbird, darting around flowers and bushes and then hovering while they extract nectar with their long tongues.
In 2019 i will try and get some better snaps of this lovely creature. This was taken in the hills behind Sai Kung in September 2018, and was a lucky snap as i chased this ever moving, every darting fast little moth.
If you have comments or questions, please go to the Facebook Page “Wildcreatures Hong Kong” (also with the same daily blog) and post them there.
Sorry, but links do not seem to work in this format, so please cut and paste this into your browser: https://www.facebook.com/wildcreatureshongkong/ For blogs in Chinese, search for "香港野 hong kong wildcreatures" Please also see www.wildcreatureshongkong.info for ID and animal information, and www.hongkongsnakeid.com for snakes. If you like what we do, then please think about making a donation...its Christmas soon. Simply go to our website www.wildcreatureshongkong.info and click on the donate button. Thank you in advance.