Is it correct to call Italian Sparrow a species?

It starts like a simple question on a walk through an Italian village: that small brown bird hopping between café tables, is it just another House Sparrow (Passer domesticus), or something more? Many bird enthusiasts have had this moment. The Italian Sparrow (Passer italiae) looks familiar, yet slightly different. That subtle difference opens a much… Continue reading Is it correct to call Italian Sparrow a species?