Thanks Rob - we don't have any nesting records out Wamboin way - but also have no idea how far juveniles may move post fledgling. The amount of Red on the head is not a good gauge of age - I have photos of chicks just poking their heads out of a hollow that have the same amount of red on their heads as Juveniles I know are at least 9 months old. So some or all the birds observed may not necessarily be from this years clutch. Would be interested in any birds seen entering or looking into hollows out near Wamboin.