Zooarchaeological inventory of the available information of the Roman forts of the western part of the Rhine delta within the research project entitled: ‘A sustainable frontier? The establishment of the Roman frontier in the western part of the Rhine delta’.The Project is an overarching research project aimed at bringing the data garnered from excavations at the various military castella in the west of The Netherlands together in order to try to determine how these installations and their troops were supplied. An important part of this project involves the analysis of both botanical and zooarchaeological material in order to answer questions about the diet and food supplies of the castella. The data reported in zooarchaeological and botanical reports are the primary source of information.