I wonder what aspect you are referring to as "ribbed" I see them as barred.
Barred feathers are entirely normal in a whole range of birds, many raptors,
waders, black-cockatoos, cuckoos, etc. Maybe Jack was referring to the shape
and Harry referring to the pattern, or both. I am not sure.
Philip
-----Original Message-----
From: Birding-Aus On Behalf Of
Harry Nyström
Sent: Thursday, 6 September, 2018 6:47 PM
To: Birding-Aus
Subject: Two "ladders
Hi,
Those are the innermost secondaries.
But maybe someone else could know or have an educated guess on why they are
ribbed?
Cheers,
-Harry
to 6. syysk. 2018 klo 11.17 kirjoitti:
> Hi
>
>
>
> Just looking at an image of an Australasian Darter (male, breeding I
guess)
> photographed a couple of weeks ago in the Botanical Gardens in Cairns.
> Photographed from behind with wings drying. Can any ornithologist tell me
> what the two "ladder-like" feathers are next to its body? I cannot find
the
> answer anywhere.
>
>
>
> Thanks in advance
>
>
>
> David in Blackheath
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