As part of the implementation of the Programme for the Conservation and Management of National Parks (PCGPN) of Benin (PCGPN), the National Center for the Management of Wildlife Reserves (CENAGREF) benefits from the support of the European Union for the component “project for the conservation and management of the W National Park complex complex” component. This component included in the Regional Project Park W Protected Ecosystems of Africa Soudano-Sahelian (ECOPAS) aims to reverse the process of degradation of natural resources in the Park for the benefit of local populations. To achieve this objective, several activities including ecological monitoring are implemented. Thus, as part of the ecological monitoring of W National Park, annual counts are planned. At the end of April 2002, a first operation was carried out. In the same period of 2003, the second edition of this activity was carried out. The prospective count aims to have a qualitative and quantitative view of the fauna of the W National Park Complex for a basis for planning activities. Specifically for this preliminary report, it was a question of having data on the specific wealth and the encounter rates of the different coins. The count concerned five areas of the Park W complex, namely: the Mékrou hunting area, the south-western zone of the Park having the shape of a “triangle”, the zone between Koudou and the triple point in the Park (Sapingou Zone), the Djona hunting zone), the Djona hunting zone and the pond zone 25. The present preliminary report gives a brief presentation of the Park W Complex and explains the methodology of the collection. and data processing and presents the results of this prospective count.