The Apostlebird (Struthidea cinerea), also known as the grey jumper, lazy jack or cwa bird often travel in groups of about 12; for this reason they were named after the Biblical apostles, the twelve chief followers of Jesus Christ.
They have a large range in Australia but I have only seen them at Humbles Creek in the Northern Territory and Mosquito Creek Road in Queensland. They do seem quite numerous in their range.
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A tight knit Apostlebird community is a beautiful thing!
Maybe a Judas bird in the midst?