House Sparrows at Skara Brae

jokingly said that these House Sparrows enjoying the walls of Skara Brae were maybe descendants of the original birds to be informed that there is no archaeological evidence of House Sparrows in northern Europe until the Bronze age see below;

Remains of the house sparrow (Passer domesticus) recovered from a late Bronze Age (1200–800bc) settlement in central Sweden are described. The house sparrow is conspicuously rare in prehistoric Europe, and this record constitutes the earliest from the northern part. The find predates the introduction of domestic fowl (Gallus gallus) to Sweden, a species with which the house sparrow has been assumed to be spread simultaneously. Instead, it is here suggested that house sparrows most likely spread over Europe along with the horseEquus caballus.