The concept of corridors is assessed in relation to corridor requirements for different species groups. A typology is further developed, and apllied for representative species. A strategy for corridor development is presented for species with a (European) protection status. Those species are selected that are dependent on large scale (international) corridors. Examples are given of practical solutions for habitat fragmentation for a selection of species. The species described are threatened in Europe, often, but not exclusively, due to fragmentation and loss of habitat. The species are protected under European and national legislation, and therefore they are relevant to the policies of European states. The result is a detailed analysis of required corridors, and other required measures for conservation of the species.