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Re: How did dromaeosaurs use their arms?
In a message dated 5/10/00 8:30:23 PM EST, firstname.lastname@example.org writes:
<< I'm afraid this isn't much of a point, because there are no living
feathered creatures that are not birds. Therefore ALL feathered creatures
living today are descended from flying ancestors. >>
That's >exactly< my point. Feathered wings evolved just once. If feathered or
feathery or hairy forelimbs conferred any kind of real advantage on a
ground-dwelling cursorial vertebrate, we would see more such animals than
just birds. Think of how many streamlined marine vertebrates (and
invertebrates) there are besides fishes. A streamlined body shape is almost a
mandatory asset to a water-dwelling predator that relies on speed and
maneuverability to capture prey.