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Re: Letters in the new Discover issue
I thought it was interesting exchange. Asymmetric feathers are NOT required
for flight. What they do do, when present, is allow the feather shaft of a
flight feather to be slightly less robust, and they also reduce the
biological cost of the moult. In other words, there is a selective pressure
that drives their development, but it is a convenience for flight, not a
requirement, and its presence is not an indicator of flight. Nor is its
absence necessarily an indicator of flightlessness.
----- Original Message -----
Sent: Monday, July 25, 2005 3:45 PM
Subject: Letters in the new Discover issue
Check out the letters section of the August Discover Magazine - "Preparing
for a delicious exchange of ideas between Stephen Czerkas and Mark Norell.