peer reviewed ; The authors are maily concerned with behavioral ecology of wildlife animals. The activity of the laboratory was mainly focused on: i/a wild mustelid, stone marten (Martes foina) in a suburban environnement ii/ a large game mammal, the wild boar (Sus scrola), in order to collect basic information needed in management operations iii/ the red fox (Vulpes vulpes) ecology in order to compare the behavior of normal and rabid animals iv/and an endangered bird species (black grouse, Tetrao t. tetrix) and his pattern of land (heather) use after a fire. All tracking studies were conducted in wooded areas of the souther part of Belgium from 1976 to 1984. The results are discussed in relation to factors modulating time and space utilization. Recently, our laboratory has been developing research programs on ecoethology and habitat partitionning of freshwater fish in the river Meuse basin. First results of a feasibility study of tracking experiments on the barbel (Barbus barbus, Cyprinidae) are also presented