This butterfly is called Macroglossum stellatarum or Hummingbird hawk-moth
This butterfly is called Macroglossum stellatarum or Hummingbird hawk-moth
See it here in my garden in the last days of September, location: Mogosoaia (near Bucharest), Romania, 2019.
The hummingbird hawk-moth is distributed throughout the northern Old World from Portugal to Japan, but it breeds mainly in warmer climates (southern Europe, North Africa, and points east). Three generations are produced in a year in Spain.
It is a strong flier, dispersing widely in the summer. However it rarely survives the winter in northern latitudes (e.g. north of the Alps in Europe, north of the Caucasus in Russia).
Moths in the genus Hemaris of the family Sphingidae are known as "hummingbird moths" in the US, and "bee moths" in Europe, which sometimes causes confusion between this species and the North American genus.
Source and more info: https://en.wikipedia.org/wiki/Hummingbird_hawk-moth