We quantified brushtail possum (Trichosurus vulpecula) diet in a mixed Nothofagus fusca-N. menziesii forest in north Westland. Diet comprised 49 food items of which four (Aristotelia serrata, Muehlenbeckia australis and Weinmannia racemosa foliage, and W. racemosa flowers) contributed 68%. The canopy dominant Nothofagus species were a minor diet component (<1%), while wood, fungi and bark were a small but consistent part of diet (10.1%). Our results are similar to previous possum diet studies in Nothofagus forests and suggest that possums are very selective in their feeding, both spatially and temporally, focusing on key preferred species in particular parts of the forest and taking advantage of different food types that become available at different times of the year. beech forest