The Leadbeater's possum ("Gymnobelideus leadbeateri") is an iconic Australian species that is listed as critically endangered under the Environment Protection and Biodiversity Conservation Act 1999. It is found in the wet ash forests of Victoria and has become endangered due to logging, recurrent bushfires and the decline of large trees containing hollows. Although there have been no sightings of the Leadbeater's Possum at the Cathedral Range it is suspected to occur there. Sightings have been made at Tweed Spur, only 3 km south from the Range. The community of Alpine Ash found in the park is suitable habitat for the possum.