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Barn owl is a basically predator bird/species and is a successful bio-control agent of rats/mice, a serious pests of our cash crops. Barn owl is abundant in agricultural fields of Sindh and Balochistan,Pakistan. It eats greater proportion of small mammals, among small mammals it prefers the rats/mice (agricultural pests). Using pelvic bones we can distinguish between sexes and thereby sex structure. Using the pattern of teeth we can determine the age and thereby age structure.It is suggested that to use this bio-control agent in agricultural fields to cut down the use of redenticieds which are costly and harmful to non-target species.