Why can spiders predict the weather?

"Spiders weave webs, and it will clear up after a long rain", which means: when it rains, spiders start to weave webs to catch insects, which indicates that it will clear up; On the other hand, spiders close their nets, which indicates that it will rain. So, why do spiders have this ability to predict the weather?

A: Scientists have found that spiders can predict the weather mainly because they are quite sensitive to humidity changes in the air. It turns out that there are many small spinnerets on the spider's tail, which are sticky and cold. When rainy days come, because of the high air humidity and a lot of water vapor, the water vapor is easy to condense into small drops on the spider's spinneret, which makes it difficult for the spider to spin silk, but it stops spinning and closes the net. On the contrary, when the air humidity becomes smaller and the weather becomes better, spiders can spin webs smoothly without interference from small water droplets.

Besides spiders, there are many animals in nature that can also predict weather changes. For example, ants move and it rains heavily. Before the heavy rain comes, the ant nest built in the soil will become wet because of the increase of air humidity. In order to avoid flooding, ants often move before heavy rain.

The loach is tumbling, and heavy rain is coming. On sunny days, the water contains a lot of oxygen, and the loach lives quietly at the bottom of the water. Before the arrival of heavy rain, the oxygen content in the water decreased, and the loach found it difficult to breathe, so it kept rolling up and down in the water.

The birds are cool and the rain is heavy and strong. In summer and autumn, the weather is sultry and the air is humid. Sparrows feel itchy and fly to shallow water to take a bath to dissipate heat, which indicates that it will be rainy in a day or two. If a large group of sparrows take a bath, it indicates that there will be heavy rain in the future.