Why do seagulls fly low to indicate sunny days?

Generally speaking, if the weather is bad, seagulls flying low at sea are likely to be dangerous and will be blown into the sea by wind and waves, and so on. They will definitely hide on the shore and rocks in advance. It's like a fisherman going out to sea in good weather and landing in bad weather.

If seagulls fly close to the sea, the weather will be fine in the future; If they wander along the seaside, the weather will get worse gradually. If seagulls leave the water and fly high, flying from the sea to the seaside in droves, or flocks of seagulls gather on the beach or in cracks in rocks, this indicates that a storm is coming. Seagulls can foresee storms because their bones are hollow and tubular, and they are filled with air without bone marrow. This is not only convenient for flying, but also like a barometer, which can predict the weather changes in time. In addition, the hollow feather tubes on seagulls' wings can feel the change of air pressure sensitively, just like a small barometer.