Let's talk about the truth behind "a dog knows his new husband". Dogs have the highest IQ among all domestic animals, and their encephalization index (EQ) is also the highest, slightly higher than cats (1.2: 1.0). A high IQ enables dogs to learn and observe words and colors. Dogs are the earliest successful domesticated animals.
Swallow is one of our most common birds. They used to have many sparrows. They like to move around the village and make people's homes their own.
However, swallows refer to a variety of birds, including more than 70 different birds of the family Yanidae and Swift. Among these swallows, we are familiar with domestic swallows, golden-waisted swallows, swift and swallow. Among them, domestic swallows and golden-waisted swallows are the two most common. The feathers of domestic swallows are blue-black metallic luster, the feathers on the forehead and neck are chestnut, and the feathers of golden waist swallows are chestnut.
Although many swallows now live next to humans, in fact, in the primitive stage, swallows and humans did not disturb each other. It was not until people lived in caves that swallows began to try to associate with people. According to current archaeology, the communication between swallows and humans can be traced back to about 200,000 years ago (traces of swallows' survival were found in the site of Peking Man).
Because swallows, like people, move during the day and rest at night, and swallows also have the habit of throwing out their own and their chicks' droppings, primitive people are not disgusted with swallows settling down in their "home".
About 10,000 years ago, humans began to cultivate agriculture, and their dwellings changed from caves to self-built houses. At this time, swallows still follow humans. At this time, people find that swallows not only don't disturb themselves, but also can see them busy in the farmland during the day, because swallows are mainly insects-eating birds, especially the pests in the farmland are their favorite, which makes people's affection for swallows instantly double.
In ancient times, people regarded swallows as auspicious birds. The phrase "King Xie Tang flew into the homes of ordinary people in the old society" is enough to explain the status of swallows in people's hearts at that time. People think that swallows only nest in rich families. Once the swallow leaves, it means that the family is in decline. Once the swallows come to nest, it means that the family will flourish.
Although swallows live next to people, they are not domesticated animals, but still belong to a wild bird. They live and reproduce on their own except by borrowing a corner from others, that is to say, others will not provide any food for swallows, so in fact, the poverty of others has little influence on swallows.
Moreover, friends who grew up in the countryside know that swallows not only live in rich families, but also "ordinary people's homes" are their choices. For example, when I was a child, my family was poor, but a nest of swallows built their nests above the light in the middle of my living room from the year I was born, and didn't leave until my hometown was renovated.
Obviously, swallows can't tell the poor from the rich, but one thing is certain. Swallows really don't nest in poor families, and the nesting families they choose are generally relatively acceptable. This is not because they know that people are poor and rich, but because people's poverty and wealth determine that home symbols do not meet their nesting standards.
Swallows can't tell the difference between the rich and the poor, but their choice of nesting sites and personality determine that they rarely settle in poor families. It's just that people in the past didn't understand the habits of swallows, so they have the saying that they know nothing.
Of course, as an insecticidal bird, swallows are beneficial birds and our good helpers, and people's love for swallows also protects them from the side. However, nowadays, with pesticides and pollution, the number of swallows has become less and less.