Tree hollows provide shelter for a range of forest mammals and
thus appear to be an essential resource for the persistence of many
species (Gibbons and Lindenmayer, 2002; Banks et al., 2011). This
resource is declining due to modern forestry, which reduces the
availability of large and old trees with cavities (Gibbons et al.,
2008; Ranius et al., 2009). There is thus increasing interest in
understanding how mammals use tree hollows, and how the
shortage of hollows can limit their populations (Lindenmayer
et al., 2012a). This information is essential for the sustainable
management of forests, if these are to maintain habitat conditions