Greater gliders have declined in many parts of south-eastern Australia, with local extinctions in some areas. They require tree hollows for dens and so are found in forests with large old hollow-bearing trees. The project focuses on greater glider populations in the mountain ash forests of the Victorian Central Highlands. This project aims to 1) quantify how populations in the focus region are changing across space and over time; and 2) identify the factors underpinning the observed changes. The work will document the effects of fire, landscape change due to logging operations and the rates of large old tree decline in mountain ash forests. These drivers will be explored against a background of environmental factors that can influence the distribution and abundance of the greater glider, including forest age, slope, aspect and climate variables. This project complements other work on the greater glider by the hub.