Why can animals predict the weather?

Everyone may have known since childhood that "ants moving" indicates that it will rain. This is probably the most well-known example of an animal's "predictive" ability.

In addition to ants, the people also summed up many "animal predictions": pigs pick grass in the morning, which means it will rain after 36 hours, and pick grass in the afternoon, which means it will rain after 20 hours; It's late, but the sheep don't go home. They just bow their heads to eat grass and don't like to walk, which indicates that it will rain the next day. In the morning, if there are a large number of bees scrambling to fly out of the nest to collect honey, it means it is sunny today, otherwise it means it will rain.

Why can animals "predict" the weather? Some reasons are very simple, such as the thin wings of bees, the increase of atmospheric water content and low air pressure in rainy days, and the wings will become soft and heavy when they are wet, so bees are reluctant to leave their nests in rainy days.

The tortoise sweats and takes an umbrella when going out. The turtle's back shell is wet, and the lines on the shell are mixed and dark, which is a sign of rain. There are drops of water on the turtle shell, like sweating. It's going to rain heavily. The dry shell and clear lines indicate that it will not rain in the near future. This is because the turtle body sticks to the ground and the turtle back is smooth and cool. When warm and humid air moves, water drops will cool and condense on the turtle's back, and it will rain. On the contrary, the air is dry and it won't rain for the time being.