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Re: How did dromaeosaurs use their arms?

Nick Pharris wrote:

>But feathers produce a huge amount of air resistance, and that can affect
mobility as well, especially if the animal is light and has a high center of

Actually, feather covering  has been shown to intrinsically decrease drag
and enhance lift (see: Werner Nachtigall, Starlings and starling models in
wind tunnels, Journal of Avian Biology, 29: 478-484.)  But Nick's point
remains valid--that changes in the aerodynamic performance of limb elements
certainly has the potential to change the animal's maneuverability, perhaps
less so in two dimensions, but perhaps more markedly so in three dimensions.