Macroglossum stellatarum

[denzjos]

This afternoon, while I was sitting in the garden with my wife drinking a cup of coffee, someone came by to look at the flowers : a hummingbird hawk-moth (Macroglossum stellatarum) is a species of hawk moth found across temperate regions of Eurasia. The species is named for its similarity to hummingbirds, as they feed on the nectar of tube-shaped flowers using their long proboscis while hovering in the air; this resemblance is an example of convergent evolution.
(text wikipedia)
I have never seen anything like this in my garden. Always welcome. (It would not drink some coffee, just like the flowers)
This is the one :

   

[Tas_mania]

An interesting observation. I wonder if they use the tube like a drinking straw? It's very thin so nectar may flow by capillary action. They are fertilizing plants while they feed on nectar, like bees.