Amazing Julie, and my congratulations for your usual excellent and patience observation skills, as well as the great photos.
While HANZAB indicates it is multi-brooded and can make up to 10 nesting attempts, and rear up to 4 broods, per season, I am not aware any evidence of this happening in the ACT, probably due to the limited breeding information, with the 2015-2016 ABR noting
that breeding has only been reported for 9 of the past 30 years.
So well worth writing up for CBN!
I expect the 5th bird may well be a juvenile from the previous brood. HANZAB mentions that fledged young can stay in the natal territory for up to 1.5 months, but that both parents drive the young from the territories. This would be consistent with your
observations. Note there does not seem to be any evidence of helpers at the nest based on my reading of the usual turgid HANZAB text.
Sent: Thursday, February 22, 2018 3:25 PM
Subject: [canberrabirds] Re: Update - Red-capped Robins - Gungahlin
Some of my dates are incorrect in my email ... apologies ...
Interesting sighting was Feb 12 (not 10) and
Joh and I saw the 5 birds a week later (Feb 19).