This book describes advantages and disadvantages of House sparrow and how it damages the crops as pest. What control measures people have been and are taking to control this pest. Different mthods have also been described to prevent the damages they cause to agriculture. Breeding behaviour of House sparrow has been described in detail. Type of feed young and adult feed on has been described in detail. Parental care of this bird has also been described. In the second part effects of a homeopathic medicine, Natarum muraticum have been investigated. When this medicine was fed to male and female House sparrow it drastically damaged the reproductive potential of both male and female house sparrow. The birds fed on Natrum muraticum totally failed to produce sperms and eggs and were no more fertile.