Anthony
There is a paper somewhere (Emu??) that describes the foraging niches of
the Golden Whistler. Yes, the male does forage, on average, higher than
the female. I'm sure someone out there will come up with the precise
reference.
In regards the "shyness" of the male. It is also possible that there are
simply many more female plumaged birds out there than coloured males.
Males do not attain the gold plumage until at least their third year so
there will always be more female like birds in the population. It is also
possible that not all full plumaged male birds migrate, or at least not as
far as brown birds. This would further increase the ration of brown to
gold birds in a wintering area.
Cheers
David
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