One dam on the farm is just a muddy reservoir with very little in the way of vegetation. Cattle have access on every side. But there must have been enough for the dragonflies and damselfies. The first image shows a damselfly that has caught what appears to be a fly. I have limited internet access so I can't research the species but maybe it is male and female of one genus of damselfly, and one genus of dragonfly that used cow pats as resting places.
PS Our friend from Gippsland has identified them for me. The top damselfly is a Blue Ringtail Austrolestes annulosus, next is a Red and Blue Damsel Xanthagrion erythroneurom and the dragonfly is a Blue Skimmer Orthetrum caledonicum. (Thanks DF).