Certain species appear more susceptible than others; for example, 30% of house sparrow mortality is linked to the domestic cat.
Other times, they may be commensal, as when species such as the house sparrow have benefited from human activities.
The female has a darker and greyer crown and cheek than the female house sparrow and the shoulder is darker chestnut.
The male gives a call somewhat different from that of the house sparrow when displaying at its nest.
A few species, like the house sparrow and northern grey-headed sparrow scavenge for food around cities, and are almost omnivorous.
It has a streaked brown back, somewhat resembling a house sparrow, but adults have a grey head and red-brown spotting on the underparts.
Its flight is strong and undulating, and it gives a characteristic explosive shreep call, somewhat similar to the chirp of a house sparrow.
It frequently prefers wetter habitats than the house sparrow, and it is often colonial and nomadic.
