How do animals "predict" rainy days?

Many animals have the instinct to predict the weather, and according to the behavior of animals, we can also judge that the weather is about to change, just as the agricultural proverb says: Swallows are flying low in the corridor and heavy rain is coming soon. Animals are quite sensitive to changes in air pressure, and observing their reactions will help you predict the weather changes in the next day or two. Insect-eating birds will hunt in the sky on sunny days and fly quite low before the storm comes. If rabbits unexpectedly appear during the day, or you see squirrels storing a lot of food in their nests, it usually means that the weather is going to get worse. In the morning, sparrows crow to show that the weather is fine-sparrows are very sensitive to weather changes, and the better the weather, the more crows crow. The increase in lark calls indicates that the weather is fine-the brisk calls from larks in the distance can prove that it is a good day with dry air. Spider: I saw water droplets on the spider's web this morning. Today will be a sunny day. Because on sunny days, the temperature difference between day and night is relatively large, and the warm and humid airflow will condense into small water droplets when it is cold. On a sunny afternoon, if spiders make many webs, it will rain for the next day or two. If the net is solid, the wind and rain will be bigger, otherwise, it will be smaller. Netting after rain means it will clear up. Frog: On the eve of rain, the air humidity increases, and the frog's sensitive skin will feel it immediately. Perhaps for fun, on the eve of rain, frogs will keep chirping, and the volume is higher than usual. Before the weather turned to rain, the humidity in the air was high, the frog's skin was moist, the frog croaked little and the frequency was low. When the storm comes, we can't hear frogs. But on sunny days, frogs will bark loudly. Earthworms: Earthworms get out of the ground, which means it will rain today. Because earthworms breathe through the skin, too dry air is not conducive to their capture of oxygen. On the eve of rain, the air humidity increases, and earthworms will be happy to get out of the ground. If earthworms crawl out of the ground in spring and summer, heavy rain often comes. When the weather gets worse, the humidity increases and the ground gets warmer, earthworms will drill out of the ground. Dragonfly: When the dragonfly flies low, it will rain. Before it rains, the low pressure makes insects close to the ground. Dragonflies feed on small insects. Dragonflies must fly low in order to eat food. Ant: When heavy rain comes, ants will move their homes to higher places. Therefore, when they see ants moving, it often indicates a heavy rain. Snakes: Snakes are very sensitive to air humidity. Like ants, snakes will move from low places to high places before it rains. Swallow: Swallows open their mouths to catch insects in the air when flying. On the eve of rain, they can only fly low to eat insects for the same reason as dragonflies. When the weather gets bad, most insects fly on the ground. Swallows want to eat insects, so they fly very low. Note: The statement that swallows fly low and dragonflies fly low and rain is not necessarily correct. This phenomenon can only show that the air pressure is low and sometimes it doesn't rain. Fish: In the summer evening, if there is a "diving" phenomenon in the fish pond, it indicates that there will be a thunderstorm. Chickens and ducks: Chickens return home early, and the next day is usually sunny. On the contrary, if you enter the cage when it is getting dark, the weather will get worse. Ducks and chickens behave in the opposite way. Ducks are animals in love the water, and the early arrival of ducks in cages means that the weather will turn bad. On the contrary, the next day will be sunny. Cat: Cats wash their faces with their front feet because when it rains, the humidity increases and fleas move on cats. Note: cats love cleanliness, and even wash their faces when it doesn't rain. Animals scratch: dryness makes their skin tight. When the weather is wet, their skin begins to stretch, but their hair becomes tight. Perhaps this tightness and looseness bring itching, or perhaps it is to better defend against the rain. Before it rains, animals will keep scratching and combing their hair. Human body changes: scars will itch on the eve of rainy days; The injured joint will be very painful; Rheumatoid patients are also good weathermen. Meteorological proverb about animals: 1. Swallows fly low, it's going to rain. This is the most common phenomenon. When it rains that day, all kinds of mosquitoes move at low altitude due to water vapor and low pressure, so swallows and dragonflies will fly low for food. 2, pigs hold grass, cold wave to the folk "dogs are afraid of navel cold, pigs are afraid of mouth cold", so when there is a cold wave in a day, pigs will hold straw mats to keep out the cold. This shows that pigs are very sensitive to climate change. 3, the chicken stays late and it is rainy, and the chicken will rain in the sun. Chicken is an animal that likes dryness and is afraid of humidity. When it rains, on the one hand, at this time, insects are active, easy to feed, and unwilling to circle; At the same time, drying wings in the sun and "bathing" in the sand are just for moisture protection. 4. Crows fly in groups, and the cold wave is coming. Because crows are black feathers, they are uncomfortable in hot weather and will fly around in droves, and this phenomenon often appears before the cold wave comes. Spiders weave webs to repair their webs. Spiders make a living by catching insects in nets, and wind and rain will destroy their webs, so they will reopen or mend their nets when it is sunny, and it is often in the early morning or morning. 6, ants move, it will rain (ants nest, it will rain) Ants like to live in a dry and wet environment. If it is rainy, they will choose to dig a new nest in the high place. If it is a short rainy day, they will also build their holes very high (like sandpits), and the location of their activities and the height of their nests are often just close to the location of rainfall. It is more accurate to observe big black ants. 7. Frogs sing in groups, and heavy rain will fall on the skin and organs of frogs, which are sensitive to weather changes. Whenever the wind and rain come, they will crow in droves. In addition, due to geographical location, altitude, topography and other differences. These proverbs don't apply everywhere, so they must vary from place to place. Local farmers are most familiar with this, so they can ask more and learn more.