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Within its core highland range, Leadbeater's possum (Gymnobelideus leadbeateri) occurs predominantly in tall montane ash forest dominated by Eucalyptus regnans, E. delegatensis and E. nitens. To improve predictive modelling of suitable habitat, we surveyed ash/non-ash ecotones and also explored the species' recently extended eastern distribution. We detected Leadbeater's possums at 19 sites, including six in non-ash forest dominated by £ dalrympleana, E. viminalis or E. kybeanensis. This extends its known distribution by 5.5 km and appears to delineate the north-eastern limit of its range. Our results add to previous findings indicating Leadbeater's possums have slightly broader range limits and habitat flexibility than previously thought. [ABSTRACT FROM AUTHOR]