Is it a bird? Is it a plane? No...its a moth!
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.
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