If that area is no longer present they will construct a new one. The male and female bank swallow help in the construction of the nest. They cling to the bank and peck, once inside they kick the dirt backwards. The ephemeral nature of the nesting banks results in low levels of nesting fidelity. Nests can also be found next to railroads and under highway embankments.
Exotic species are no threat to the bank swallow.
This is because of their unique nesting habitat requirements. Erosion and human interference, insect infestation and predators threaten the Bank swallows. Even though, erosion is sometimes necessary to create vertical cliffs necessary for building nests. Predators also are a threat. Along cliff faces, coastal erosion threatens to destroy their homes.