Why do swallows have to be very low before it rains?

When it is about to rain, the humidity of the atmospheric clouds increases, resulting in an increase in the pressure in the upper layer. Oxygen is concentrated near the surface. Many creatures breathe oxygen close to the ground, such as swallows, dragonflies, etc.

At this point they can prey on a large number of insects. In addition, due to the high air pressure above, they cannot fly upwards and can only glide near the ground.

Because the air is humid before the rain, the swallows' feathers will be stained with dew, so they must not be high.

Swallows fly low because the air pressure in the rainy area will drop slightly, and under lower air pressure conditions, the air becomes thinner, and the oxygen content decreases, so that many small flying insects that usually stay at half an altitude gather near the ground, and swallows also fly low to prey.

Swallows spend a lot of time catching pests in the air and are one of the most flexible passerine species, mainly feeding on mosquitoes, flies and other insects, and are well-known beneficial birds. Nest in tree holes or crevices, or drill holes in sandy banks, or stick mud on walls or protrusions in corridors, roofs, eaves, etc. in urban and rural areas.

Because it was very humid before the rain, there were dew drops, which got on the small insects, and the small insects flew low, and the swallows flew low and ate the small insects.

Swallows fly low before rain because of the air currents and also to prey on insects.

Because the air humidity is high before the rain, the wings of insects flying in the air are damp. In this way, the insects have more difficulty flying and their flight altitude is lower than on a sunny day. These insects are the food of the swallows, so if the swallows want to catch the insects, they must lower their flight altitude to catch them.

In addition, when it is about to rain, the air currents in the air are turbulent, and swallows are affected by the air currents so they fly very low.

Signs before the rain

1. Ants will move: Ants who dig holes in the ground and live will run away before the rain when they feel that the hole will be flooded if it rains.

2. Earthworms come out of holes: The ground is wet and soft, and earthworms will crawl out of the ground, indicating that it will rain.

3. Sky: The air humidity increases, the air pressure decreases, the sky is dark, the clouds are thick, and sometimes there will be thunder, lightning and wind.

4. The fish will float to the surface to breathe: the air pressure in the water is low, and the oxygen dissolves less, so the fish will float to the surface to breathe.

5. Puppy tongue: There are no sweat glands on the dog's body, and the heat can not be dissipated by pores in the hot summer, only by opening the mouth and pulling the tongue to dissipate heat to maintain a constant temperature.

6. Snake aisle: Most snakes hide in the hole during the day, and go out at night to forage, drink, bathe, molt and other activities, but the weather is particularly humid and stuffy when it will also be forced out of the hole, therefore, the snake out of the hole during the day is a sign of rain.

It is because of the change in atmospheric pressure of the weather, and the low air pressure causes swallows to fly around, because swallows are the most sensitive to the air pressure field.

1. The principle of swallows flying low: when there is a lot of water vapor in the air, the air pressure in the air will become lower. When the air pressure becomes low, the survival of the flying insects will be affected to a certain extent, so the flying insects will fly up from the ground and hover at a low altitude, and wait for the air pressure to rise before landing, and at this time the swallows will fly low.

Therefore, it can also be said that swallows fly low because of low air pressure.

2. Explanation of air pressure: Air pressure is the atmospheric pressure acting on the unit area, that is, the gravitational force that is numerically equal to the vertical air column that extends upward to the upper boundary of the atmosphere on the unit area. The famous Magdeburg Hemispheric Experiment proves its existence.

The international unit of air pressure is Pascal, abbreviated as Pa, and the symbol is Pa.

Summary. Hello, yes such a dear. Many times, when it is about to rain, you will find that the swallows fly low, this is because when the rain is coming, the humidity of the air will be relatively high, and the feathers can be wet before the rain at this time, then, the wet feathers are a large weight and challenge for the swallow's flight, so they will generally fly relatively low, which is also because the weight has not allowed them to fly too high.

If it rains moderately or heavily, you can't see the swallows flying outside, not only the swallows, but also other birds, because when the rain is heavy, the rain is relatively dense, and this time is not suitable for them to fly. Hope it can help you, dear <>

Why do rain swallows fly low.

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Hello, yes such a dear. Many times, when it is about to rain, you will find that the swallows fly low, this is because when the rain is coming, the humidity of the air will be relatively high, and the feathers can be wet before the rain at this time, then, the wet feathers are a large weight and challenge for the swallow's flight, so they will generally fly relatively low, which is also because the weight has not allowed them to fly too high. If it rains moderately or heavily, you can't see the swallows flying outside, not only the swallows, but also other birds, because when the rain is heavy, the rain is relatively dense, and this time is not suitable for them to fly.

Hope it can help you, dear <>

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