Are there any swallows in the north? Why is it less and less common?

Swallows rarely appear in recent years, mainly for two reasons: the suitable nesting sites have been greatly reduced.

2. Generally, swallows can be roughly divided into two categories: one is passeriformes, the more common ones are golden swallow and domestic swallows, and the other is swift family, the more common ones are Louyan in the north and small white-waisted swift in the south. White-waisted swift, domestic swift and golden-waisted swift usually nest under the eaves. Nowadays, there are fewer and fewer traditional houses in the city, and many new buildings and buildings are not suitable for swallows to nest, because there are no eaves and there are a large number of them.

3. Some properties even poke down the bird's nest for the sake of beauty. Swifts usually nest in cracks in ancient buildings. But now, in order to protect ancient buildings, more and more buildings suitable for nesting are covered with bird-proof nets, which makes the reproduction of swift more and more difficult, so the number of swift has dropped sharply in recent years and it is difficult to see.

4. Man-made damage to interests.

Due to the soaring price of bird's nest in recent years, some people are greedy for money, looking for some buildings suitable for swallows to live in, destroying the nests of swallows, thus obtaining the sale of bird's nest, hindering the breeding process of swallows and reducing the number.