What I wrote yesterday was correct in intention (I had the right mental image)
but half wrong by missing out one link. So before anyone with a clearer head
corrects me, I will. "Anatomically moving the quadrate bone forward without
moving the palatine bone", should be: Anatomically moving the quadrate bone
forward without moving the jugal bone forward against the palatine bone." (The
palatine bone hardly moves at all.)
Philip
-----Original Message-----
From: Philip Veerman
Sent: Sunday, 8 May, 2016 5:49 PM
To: 'Con Boekel'; 'canberrabirds chatline'
Subject: Image of Black Swan
Certainly a nice close photo, to which I will comment on this and other
comments:
The serrations are normal and usually hidden when the beak is closed. I don't
know if these structures are in the bone at all. I suspect not, (I do have a
swan's skull in my collection and don't recall seeing this). It is likely to be
just part of the keratin layer of the beak. Some cartoonists like to show
birds with teeth, Daffy Duck I think commonly. Maybe that came from pictures
like this one. Anyone could easily say it looks like it has teeth but it does
not, of course.
As you have noticed, there is a bit of cranial kinesis there, although in the
reverse of what we usually see, as in it is extending the jaw hinge from the
base (I think anatomically moving the quadrate bone forward without moving the
palatine bone,) rather than extending the tip.
As for where to find Black Swans outside Aus. They are....... I was a bit
surprised to see them in a botanical garden adjoining the zoo in Wuhan, China.
Philip
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