The North-East Atlantic Arc, a vast maritime area stretching from the Bay of Biscay to the English Channel, is currently seeing the development of new uses such as offshore wind turbine projects. However, very little is known about the use of this maritime area by birds and bats, whether sedentary or migratory. In this context, it is essential to collect data to fill these knwoledge gaps and identify the main functional zones and migratory movements of the species.