Preliminary studies in the northern jarrah forest of Western Australia indicate that the smaller mammals are concentrated in dense vegetation along drainage lines. The smallest animals, such as mardo, ship-rat, house-mouse and bandicoot can be caught most readily by box and Elliot traps. For larger animals, in particular quokka, snares appear to be most effective. Certain rarer animals, such as numbat and phascogale, known to occur within the area, have not been trapped so far. Trapping in a valley prior to and after a prescribed burn revealed that the main effet of the fire is a relative increase in the number of indigenous mardos in relation to the introduced ship-rat.