yes that is what alerted us to look behind and up by the time could take photos they had split up and were going behind trees as they were flying over the visitors centre but could see there were at least 16 of them. Sorry the pics aren't any better. Hard to get close up pics of them.
For those interested in Typha there is a recently published revision based on chloroplast DNA , it includes the Australian species but no samples from Australia were included, see: Beibei Zhou, Tieyao Tu, Fanjiao Kong, Jun Wen & Xinwei Xu (2018) Revised phylogeny and historical biogeography of the cosmopolitan aquatic plant genus Typha (Typhaceae) SCiENtiFiC REPORTs | (2018) 8:8813 | DOI:10.1038/s41598-018-27279-3 available at https://www.nature.com/articles/s41598-018-27279-3.pdf
