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Re: Question: Why did birds lose their teeth?
On Thu, Mar 13th, 2014 at 12:11 PM, don ohmes <d_ohmes@yahoo.com> wrote:
> Also: The list of species in which "vestigial" claws are found is not
> negligible -- but do
> domesticated birds count, unless claws are common in the wild-type rootstock?
Most of the vestigial claws I've seen on bird wings are so small they'd be
completely lost beneath
the feathers of the live bird, so would probably have no aerodynamic
consequences at all. That
may well be why they haven't been lost completely.
The wing claws of emus and ostriches are anything but vestigial. Ratites don't
have any flight
requirements though, so there'd be no selective pressure to reduce their claws.
They actually look
like quite functional talons, so there may even be positive selection to keep
them (whatever it
might be).
Darren Naish has some great posts on his blog on the subject:
http://scienceblogs.com/tetrapodzoology/2010/06/30/clubs-spurs-spikes-and-claws
http://scienceblogs.com/tetrapodzoology/2010/07/14/spurs-blades-jacanas-lapwings
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Dann Pigdon
Spatial Data Analyst Australian Dinosaurs
Melbourne, Australia http://home.alphalink.com.au/~dannj
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