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The swallow most is willing to close to huaman, and the human the most cherish this beneficial bird. Swallows migrate every year round trip used to build nests in the same places, select the optimal height about 3-6 meters from the ground to nesting. But with the development of modern city,tile roofed house or cottage originally with the eaves , has turned into the high-rise buildings without low eaves,and most buildings surface with smooth ceramic tile, do not meet the conditions of swallows nesting. At the same time, it is also easy to be removed, so that when workers paint the wall would not destroy the swallow nest.
Dalian Minzu University
Dalian Nationalities University