There are a variety of reasons behind the declining sparrow count; with some pointing fingers at the architecture of modern houses which leaves little space for nesting sites. Add to it the decrease in shrub vegetation areas as well and the result is a drastic loss in habitat. Excessive use of pesticides in agriculture is another cause, as it causes a decrease in reproductive efficiency of the sparrows by infecting their egg sheaths and its diet, since the chief diet of sparrows is seeds, cereals and insects which in turn are the direct victims of pesticide usage.
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