This Preface must start with a very sad message: my good friend, wonderful colleague and co-editor Peter Mankowski passed away in February 2022. His death at the age of only 55 was entirely unexpected and leaves so many and also me in deep mourning. Peter Mankowski had still completed all of his contributions to this edition of the Brussels Ibis Regulation. The series of our commentaries will continue to carry his name and preserve the memory of this extraordinary scientist and person.