We used the radar at the island of Ustica (a small island located in the Tyrrhenian Sea, 70 km off the coast of Sicily) to detect raptors leaving the island during spring 2012 and 2013. We deployed the radar on the north-eastern coast of the island close to the Falconiera Promontory to investigate the water-crossing tendency of raptors. This island is attractive for migrating birds because it is isolated and some thousands of raptors, mostly European Honey Buzzards and Western Marsh Harriers migrate through the island in spring. About the half of tracked Honey buzzards flew in the opposite expected direction of migration showing an unexpected water-crossing behaviour. Here below a track of Marsh harrier leaving the island toward North-East.

Ustica2012