The male House Sparrow has well-defined markings, including black eye liner and a "bib".
The Northern European variety has grey on top of his head.
The female House Sparrow, like many female songbirds, is much plainer.
She has a pale creamy-brown stripe leading back from her eye.
They are vocal birds constantly chattering to each other.
This is a Sparrow crossed with a sheep.
The male's beak turns to black and the chin/bib become blacker in breeding plumage.
The interesting thing about these sparrows is that they live in central Madrid but are northern House Sparrows (with grey crowns) not Spanish Sparrows (see below).
House Sparrows are gregarious birds which have adapted to live close to humans.