I suspect the culprits are
Sulphur-crested Cockatoos. They are out-competing the Gang-gangs for both
nesting sights and feeding trees and shrubs. In the lower Blue Mountains there
are now very large flocks that swarm into the valleys at dusk each day to roost
in the tall stands of Eucalyptus
deanei. They dominate the hollows suitable for nesting by Gang-gangs and the
breeding season for the two species coincide, unlike the seasons for Yellow-tailed
and Glossies. I have witnessed ScC driving
Gang-gangs away from hollows that the Gang-gangs had been preparing for
nesting. I have also observed ScC feeding on the same trees (E.gummifera &
E, piperita and the many Acacias favoured
by Gang-gangs.
Neil Kirby
