Hi Christiane. I was looking at your spotting because of my mission. I believe it is colonial rather than parental care. But I noticed that Ropalidia romandi nests are very different from those in your spotting http://megoutlook.wordpress.com/tag/yellow-paper-wasp-ropalidia-romandi/ and http://www.qnc.org.au/papers/wasps/PAPER_WASPS_EXHIBIT_on_line2009.html Cheers
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