Why do sparrows like to stick to the wall?

Because sparrows are territorial during the breeding season, they stick to the wall in order to find a suitable place to live.

Sparrows are small birds, which are similar in size and color. Generally, the upper body is brown and black, so it is commonly known as sparrow. Sparrows are mostly active in places where humans live. They are extremely lively, bold and approachable, but they are very alert and curious. Many people build nests in human houses, such as eaves and wall holes, and sometimes occupy the nests of domestic swallows. In the wild, they nest in tree holes. Sometimes they can be found nesting in individual trees, but sparrows are in groups all year round. Old trees with many holes are usually their favorite nesting sites.