Is the bird familiar in your country? It belongs to a sparrow group, (though I've just known it.)
I'm not familiar with birds.
yes actually I've seen them --- according to my best recollection.
In Haiku word, migrant birds or just small birds is a season word.
coming small birds, where are your beds, keen chilly night
Grey starlings are not migrant birds, they are called drifting birds. Because they live within the country, and usually live in mountains. however in autumn they drift into towns.
Coming drifting birds, where you'll go back, your home mountain getting less.