1. Swallows usually consider wind direction, light and other factors when building nests, so the door of the nest may face north to better control the temperature and humidity in the nest.
2. Swallows usually choose to nest in the south direction, because it can better enjoy the sunshine and is also conducive to the dryness and ventilation in the nest. If swallows nest at the gate, and the gate of the nest faces north, it may indicate that the lighting and ventilation conditions at the gate are better and can provide a suitable living environment.
Generally speaking, swallows nest at the gate, and the gate faces north, which may be due to the comprehensive consideration of environment and conditions. However, it should be noted that this kind of behavior may also have a certain impact on family life and safety, which needs to be evaluated and adjusted according to the specific situation.