There is a historical example in Germany of the contribution of humans and wild birds to the ecosystem. The first country in the world that birdhouses were built was Germany in Europe. The person who invented this birdhouse was Baron Berlebsch of Germany. From his observations and experience, he devised the form of birdhouses that is still used in many countries to this day. Baron Berlepsch planted 3,000 birdhouses in 13 acres of woodland. In 1905, there was an outbreak of leaf beetle larvae in the area where the Baron lived, causing great damage. Although there was damage in the surrounding area, there was no damage in the baron's territory. The birds were preying on the leaf beetles because 560 pairs of 36 species were breeding in the birdhouses. Thanks to the birdhouses, there was almost no damage in the baron's territory.
Nowadays, when studying small birds, its habitat and the presence of insects living in that habitat are important subjects. It is the existence of what is called an ecosystem. From an ecosystem perspective, it seems essential to investigate the relationship between bird food and insect distribution. There are also concerns regarding the habitat of small birds. There are cases that normal ecosystems are becoming unsustainable due to forest devastation and overexploitation. From an ethical perspective, there is a big difference in the value of land between areas that can be maintained and areas that cannot. Crops grown on “ethical” land come with added value.
The EU and other countries are also trying to protect nature by subsidizing organic farming. Many small insects live in organically farmed fields. Frogs, loaches, and even dragonflies come in search of these insects. Small birds and raptors that prey on these animals will also live there. Crops cultivated in fields with many biological species can earn a reputation for safety and security. Organic farming is attracting attention because it maintains health and the natural environment. The decline in birds of prey is said to be due to habitat destruction, pesticides, and poisoning caused by veterinary drugs. The reasons for this are not isolated but multiple. This is especially true for chemicals such as pesticides. By the way, a single sparrowhawk, which is the natural enemy of great tits, cannot survive without eating 779 great tits in a year. Landscapes where many sparrowhawks are seen are considered safe places to grow food. As long as even a single sparrowhawk lives there, it seems to be a safe and secure place.