Apart from the four pests, why are only sparrows almost wiped out?

After the founding of the People's Republic of China, we took some detours and made some wrong attempts on how to build the country. For example, eliminating the four pests is one of them. This is mainly due to the lack of knowledge of biology at that time, and I don't know that every creature maintained the stability of the biosphere. At that time, flies, mice, mosquitoes and sparrows were listed as four pests, and people also launched a vigorous campaign to eliminate these animals. Among these three animals, sparrows suffer the most and are almost extinct, mainly because sparrows have a similar schedule to humans and have a slow reproduction speed.

Sparrows have become the main target of people's hunting. Sparrows become pests, and people will kill them when they see them. Sparrows and humans have the same schedule. They are active outside during the day. People often see them, so they catch them and even make some traps to lure sparrows, and then catch them all. In contrast, mice are luckier. They usually come out at night and are rarely seen, so they dodged a bullet. The other two animals, mosquitoes and flies, are small and good at flying, so people are not easy to catch and suffer less damage than sparrows.

Sparrows are not as fertile as other animals. Sparrows have a long breeding time. They have to lay eggs first, and after a certain period of incubation, small sparrows can be born. Mosquitoes and flies breed in large numbers and at high speed, which is particularly difficult to eliminate. Mice give birth to mice in caves, which are not easy to be found and have better living conditions. Poor sparrows, they lay their eggs in the bird's nest, not only facing the destruction of people, but also facing the destruction of other animals, so the killing behavior of people once made sparrows on the verge of extinction.

Sparrows are actually not harmful birds, they don't spread diseases, they just eat a little food at most, and killing them all is really our loss. Fortunately, at last people gradually realized that they could not kill all the sparrows, and they escaped.