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Macroglossum stellatarum
I am unable to categorize it. It was around 2- 2.5 cm. First I thought it was a bumblebee. But the insect was very active and never settled on any flower. It was drinking nectar just like a hummingbird. It mainly targeted flowers of Leucas aspera plant. I have taken a small video of it. The photos are screenshots from the video. https://youtu.be/hpCqZTyGMlE
I spotted one on my aunt's garden here in Michigan USA last summer, we thought it was a miniature bird... Pretty cool!!!