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Re: Microraptor hanqingi, new species from China.
On 5/24/2012 12:44 AM, Tim Williams wrote:
But if you're a theropod, and you want to spend a large
part of your life sitting on boughs or branches, you need to have a
way of holding on.
This is an active hypothesis, and requires evidence.
And good luck on that -- it is mechanically incorrect relative to mere
sitting or even standing on large, more or less horizontal
branches/crotches by even inanimate objects, much less well-clawed
theropods that presumably had reasonably competent balancing systems --
"large branch" being defined as relatively rigid, and significantly
larger in diameter than the contact point upon which the object or
Moreover, there is no obvious selective path to a perching foot in the
presence of active ground-foraging, the absence of active in-tree
foraging, and/or exploitation of small, flexible branches, such as are
found in the terminal branch environment.
A feathered ground-foraging creature with the ability to periodically
climb into a tree and exploit it as a safe place to rest need have no
obvious perching foot to be on a tree-to-ground flight path.