Why do swallows fly so low?

Swallows may fly low for the following reasons:

1. Foraging: Swallows are predators of insects, so they need to fly at low altitude to catch insects on the ground better. Flying at low altitude can also help swallows prey on foods that need a lot of nutrition during the breeding season.

2. Communication breeding: Swallows need to be close to the ground or buildings in order to communicate and breed, so as to choose a suitable place in the breeding season and send a pairing signal to their partners.

3. Low air pressure: When there is a lot of water vapor in the air, the air pressure will become lower. When the air pressure decreases, the survival of flying insects will be affected to some extent, so flying insects will fly from the ground, hover at low altitude, and then land after the air pressure increases. At this time, the swallows are foraging, so they fly low.

4. It's going to rain: When the weather is wet and it's going to rain, swallows fly very low because they are catching insects. The flying height of insects is very low. When the air pressure is low and the air humidity is high before the rain, the wings of insects will be affected by the air humidity and the flying height will be reduced. In order to catch these insects, swallows will also lower their flying height accordingly.

5. Protect territory: Swallows feel threatened by the invasion of alien species. In order to protect their territory, they may fly low as a warning.

Generally speaking, the reasons why swallows fly low may be varied, but they are mainly related to their predatory habits, weather changes and protected territories.