Black storks built a nest in a fork of thick oak branches. But they laid the foundation of the nest badly. In order for the nest not to fall, they would have to place strong sticks in the fork of the oak branches to maintain the weight of the nest. Unfortunately, this did not happen. The storks gradually lined the poorly laid nest with moss. As it rained, the moss sucked in water. The nest became incredibly heavy. The thin-stick base could not bear its weight any longer and almost the entire nest fell to the ground. After this incident, the storks left the site.