Abstract
Birds are one of the links of food chain in ecosystem. A large proportion of normal food of bird consists of insect, fishes, including many that are highest degree injurious to naturally or man and his concern. Fly catcher, Green beef eater, and Sparrow etc. are destroyers some insect pests, which are harmful to the agriculture as well as human beings. Some birds are valuable scavengers. These are very useful for to make clean environment. Birds contribute the cross fertilization of flowers and the production of fertile seeds and they also continuance of healthy generation of the trees. Ethically and morally we have no authority as human being for our comfort to create unsafe environment to other species of nature that have equal right to live with nature in peace as much as human race. In less than 100 years of scientific and technology advancement a period which is insignificant in the life of universe, the environment has degraded to dangerous level. This was protected for millions of years. Henceforth, we should take a pledge to advocate science and technology through only system that guaranteed safe environment. In recent years great concern has been noticed on the dangers of Environment polluting, arising as side effected rapid industrialization, it should be understand that today’s development should become tomorrow’s destruction. The natural disturbances such as Seasonal variations, Rainfall, Snowfall, Disasters, etc. and Man-made disturbances such as Festivals, Washing, Bathing, Boating, Drainage, Deposition of fill materials, Tilling of crop production, Logging, Mining, Construction, Run-off, Pollution, Eutrophication, Domestic animals etc.