Tchernov argued that the house sparrow and related species have undergone considerable morphological changes in adapting to a commensal relationship with humans, with the beak becoming longer and narrower.
The disappearance from the conurbations of such a common species as the house sparrow may have implications which we ought to consider seriously.
No one disputes that the common house sparrow is a pest.
Both the starling and house sparrow are currently listed on some of these licences.
The birds that do most damage appear to be the bullfinch and the house sparrow.
While changes in agricultural practices are implicated as causing declines in house sparrow numbers in farmland areas, there is no evidence of significant declines in urban areas.
The female is effectively inseparable from house sparrow in its plumage, which is grey-brown overall but more boldly marked.
It frequently prefers wetter habitats than the house sparrow, and it is often colonial and nomadic.
