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yours are mainly males
How can you tell Daniel?
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If I may borrow —but not edit — your take Dave
for a little demonstration…
Red is adult male: flat top and triangular shield
Yellow is ad. female: curved top and tear shape.
Interesting ... everything I have read indicates that sexing can only be done by measurement or 'biological' testing, where is your reference to the shape of the cere (shield)?
So what about the big fella with the orange beak , coot in drag
I think he is mistaken Daniel"The shield shape is valid only on adults. Teens
and chicks may be very difficult read confusing."
This was told to me by a teacher at the Graz uni!
I think he is mistaken Daniel
where is your reference to the shape of the cere (shield)?
If I may borrow —but not edit — your take Dave
for a little demonstration…
Red is adult male: flat top and triangular shield
Yellow is ad. female: curved top and tear shape.
So what about the big fella with the orange beak , coot in drag
Not necessarily!Well, you learn something new every day
Not necessarily!