thickening? These details can help explain what you are seeing. For a reliable prediction, however, check a weather forecast rather than relying on bird flight alone.
Perhaps the best answer to the question in the image is this: Grandma was probably thinking of rain. Low-flying birds can sometimes accompany unsettled weather, especially when they are following insects or adapting to wind. The old saying carries a little truth, a little uncertainty, and a reminder that nature offers clues—but rarely simple guarantees.
