Tchernov argued that thehousesparrowand related species have undergone considerable morphological changes in adapting to a commensal relationship with humans, with the beak becoming longer and narrower.
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The disappearance from the conurbations of such a common species as thehousesparrowmay have implications which we ought to consider seriously.
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No one disputes that the commonhousesparrowis a pest.
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Both the starling andhousesparroware currently listed on some of these licences.
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The birds that do most damage appear to be the bullfinch and thehousesparrow.
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While changes in agricultural practices are implicated as causing declines inhousesparrownumbers in farmland areas, there is no evidence of significant declines in urban areas.
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The female is effectively inseparable fromhousesparrowin its plumage, which is grey-brown overall but more boldly marked.
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It frequently prefers wetter habitats than thehousesparrow, and it is often colonial and nomadic.
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Its flight is strong and undulating, and it gives a characteristic explosive shreep call, somewhat similar to the chirp of ahousesparrow.
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It has a streaked brown back, somewhat resembling ahousesparrow, but adults have a grey head and red-brown spotting on the underparts.
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A few species, like thehousesparrowand northern grey-headed sparrow scavenge for food around cities, and are almost omnivorous.
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The male gives a call somewhat different from that of thehousesparrowwhen displaying at its nest.
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The female has a darker and greyer crown and cheek than the femalehousesparrowand the shoulder is darker chestnut.
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Other times, they may be commensal, as when species such as thehousesparrowhave benefited from human activities.
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Certain species appear more susceptible than others; for example, 30% ofhousesparrowmortality is linked to the domestic cat.
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