Figure 1

The relationship between human presence and the breeding nests of barn swallows(n = 149). (A) illustrates variations in the presence of people in buildings where swallows attempted breeding nests. “O” represents buildings occupied or used by people, and “X” represents vacant buildings. (B) is a reclassification of A's results, specifically focusing on nests located in vacant buildings and categorizing them based on the intensity of human activity in the vicinity. “O” signifies human activity, while “X” represents the absence of human activity. According to (B), among the 8 nests in vacant buildings from (A), 3 nests were actually located where substantial human activity occurs, and a total of 144 nests were situated in places with high human activity.