Nest-tree species and nest cavity availability
The availability and density of potential nest-tree species (species that attain
large size or are emergents) were assessed from twenty-one 0.25 ha (50m × 50m)
vegetation plots (5.25 ha). The availability of potential nest cavities on 180 trees
was assessed in fourteen 10 m radius circular plots (0.44 ha). All trees were
scanned for the presence of cavities; the height of cavities from the ground was
recorded.