I don't know if anyone else has noticed this but in the winters in Canberra I
observe a behaviour amongst Crimson Rosellas I don't see at other times of year.
At this time the rosellas seem to go around in larger groups, and some of the
birds (maybe the males) give a cackling call from time to time while they are
interacting and shake their tails from side to side simultaneously with the
calls. I haven't seen them do this at other times of the year. Eastern Rosellas
do the cackling but not the tail shaking.
I haven't noticed that this behaviour coincides with obviously aggressive
behaviour, but I suppose it has to do with social dominance &c
John Leonard
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