M.Ranganathan - Railwayline main road Near Bharathiar I.T.I Dharmapuri Tamil Nadu

These sparrows used to come in groups of 30 to 60 and sat in a small bush near my house in the morning and evening. My wife used to throw some foodgrains in front of my house in the street. In the beginning the sparrows did not mind. Slowly they started to come and sit in front of the house in groups of 3 to 6 and ate the grains.When days passed they started to come in groups of 20 to 50 and started eating the grains. After few months I could not see them. Now a days I dont find them in groups.I could rarely watch one or two sparrows in the morning .Where did they go?