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Re: Thou Shalt Not Climb!



Kris Kripchak (mariusromanus@aol.com) wrote:

<So, what I'm wondering, is how did selection take place for pre-perching birds
that were landing in trees with zero adaptations for such?>

  They flew before they landed, as it were, and they flew from places other
than from trees. But the features have always been there in pre-avian
maniraptorans, from the highly rotary shoulder, the large forelimbs with
grasping claws, and the highly mobile hindlimb. The only really non-arboreal
portion of these animals' anatomies is that the tail seems poorly adapted for
arboreal transit. But grasping and climbing arrives before jumping, which
preceeds gliding, then flight, then landing, then perching, and so forth. These
grasping and climbing features are seen in a host of pre-avian maniraptorans.

  Cheers,

Jaime A. Headden
http://bitestuff.blogspot.com/

"Innocent, unbiased observation is a myth." --- P.B. Medawar (1969)


       
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