Rooks are protected birds, which breed in colonies. CABWIM has figured out that moving old nests is important for moving rook colonies. The methodology comes close. Customisation and research in the previous season is needed in relation to routines in nest building and food searching. Based on this, CABWIM selects the alternative nesting site. 

CABWIM stands out in this work. 

CABWIM has advised over 30 municipalities since 2003, not only in the Netherlands, but also in Germany, Luxembourg and Switzerland.