As you can see, sparrow house-building is on at a furious pace !

I found this study from the UK : A sparrow needs to eat 82 % of its body weight in insects and centipedes daily ! but when subsisting on cereals, 36 % of its body weight will do..

The sparrow-hawk which is very similar to a Shikra has to eat 28 % of its body weight in birds. That amounts to two sparrows a day !

A Lapwing - Teetri, needs to eat 46 % of its body weight if it subsists on anthropods - insects, centipedes, milipeeds and spiders.

Here's something depressing we all need to do something about : A study published this year, is the first ever comprehensive census of the weight of living creatures. Humans account for about 36 percent of the biomass of all mammals. Domesticated livestock, mostly cows and pigs, account for 60 percent, and wild mammals for only 4 percent. The same holds true for birds. The biomass of poultry is about three times higher than that of wild birds.

Before we started doing mega destruction of other mammals, those on land were 7 times those now alive, and those in the seas were five times now alive. 

We need to actively limit our own population and even more than us, the population of the cattle whose products we consume.