They have returned from the east and settled near the Basilica overlooking the city. The rooks have been back in Brussels for ten years now. They have had to make room for themselves among the other corvids - crows, jackdaws, magpies - and the many species that have invaded the city: peregrine falcons, parakeets, Egyptian geese, Canada geese, etc. Faced with these newcomers, city dwellers react according to their sensitivity to wild nature. Some fear for the local species and would like to chase away the intruders. Others are exasperated by the croaking and chattering. Some are pleased that the capital of Europe is home to an increasingly varied biodiversity, despite the incessant overflight of airliners.