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Re: Great blue heron - Pterosaurs



I responded to Don offlist in some detail.  You are correct, David -- crests
and wings can lift horizontally (and down) just like boat sails.  Lift is a
more general term than upwardly directed lift, and can point in any
direction.
All the best,
JimC

David Peters wrote:

> >A sailboat sail has lift. Perhaps this was applied similarly in
> pterosaurs. Jim, hopefully will have more to say on this...