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RE: A four-winged Archaeopteryx?

Tom Holtz wrote:

> So even if truly present, long hindlimb feathers do not necessarily support the 4-winged > hypothesis. Maybe such feathers would be equally useful in a ground-up hypothesis scenario: > helping steer long leaps etc.

Or help steer while coming down out of the trees.

This also underscores just how artificial the old "ground-up" versus "trees-down" argument was when discussing the evolution of avian flight. Both behaviors may have been important. They certainly weren't mutually exclusive.