Hello David,
I've always looked at the size of the bird as I always assumed that the 
female was the larger bird, although that can be a problem with the 
posture the bird strikes from time to time. The presumed male bird at 
Delta was a rescued bird and eventually released in that area and 
commonly called "Noddy" by the Phllips. Of course we are not sure if 
this is the same bird each year at the nest. The amazing thing about 
this male bird seems to be its total dislike to roost high in the trees 
much preferring the low branches to a maximum of 2m.
The Delta birds have two fluffy/downy chicks while the Brisbane St bird 
has one chick about a week old. Notes have been recorded for the Nest 
Record Scheme.
Haven't had an opportunity to get out to Cape Edgecumbe since I returned 
from holidays, will make an effort this weekend.
Jon Wren Bowen
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