House sparrow prefer crevices and holes in man-made structures rather than naturally occurring nesting sites and are found to live in close proximity with human beings rather than in extensive forests or woodlands.It is one of the endangering species of recent times.It has various roles to play in the urban environment and also helps to keep the ecological balance. The reasons for its declining are many such as lack of nesting places, food and unwillingness of common man to coexist with it etc