Summary

The Azores Archipelago hosts approximately 75% of the global breeding population of Cory’s shearwater (Calonectris borealis). This species faces threats ranging from habitat degradation and invasive predators to climate change, which increase the vulnerability of its breeding sites. Effective conservation and threat assessment require data on breeding habitats, yet such information remains scarce. To address this gap, we aimed to provide a standardised baseline of the spatial and structural characteristics of active nests in the Azores Region.