Localised predators include Eleonora 's Falcon in the Columbretes Islands and the nocturnal Barn Owl in the Balearics ; a few owls can wipe out a colony .
Localised predators include Eleonora 's Falcon in the Columbretes Islands and the nocturnal Barn Owl in the Balearics . 
 A few owls can wipe out a colony .