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Re: Campbell's even crazier than a MANIAC? (archeopteryx climbing)
First, WAIR is Wing-Assisted Incline Running. It doesn't specify what kind of
incline - it could be a tree branch, or a rock ledge, or part of a river bank.
Secondly, your question concerning the use of the proto-wings to help capture
insects has been proposed before, but not being used to provide a Bernoulli
Effect suction, but to wave the bugs towards the mouth. (Forgive me if I got
this wrong, but I think John Ostrom first proposed it [It's been a long day, so
Hopefully, this helps,
Date: Thursday, September 04, 2008 6:11:45 pm
From: Erik Boehm <email@example.com>
Subject: Re: Campbell's even crazier than a MANIAC? (archeopteryx climbing)
> Humans possess pronating and supinating wrists, a highly
> mobile shoulder joint that can rotate the arm about its axis
> with a nearly 160 degree range of movement in three
> dimensions, and they can, to some degree, supinate the
no doubt we have climbing adaptations, but we lost others such as a prehensile
foot and a prehensile tail. This point was in response to the statement made
> Archaeopteryx not only lacks those adaptations, but the phenotypic
> trend of maniraptorans is to do the exact opposite
My point is a trend away from an ability, does not mean that ability is no
What is WAIR?
I'm not saying archie climbed trees, especially not like a squirrel - just that
the absense of the adaptations mentioned may not be relevant.
Furthermore, if archie or some hypothetical ancestor of archie did climb up
something to glide, it wasn't neccesarily a tree, as I mentioned boulders and
> The problem lies in several elements,
> including the apparent "half of a wing". What use
> is such a structure on the evolution towards flight?
Is holding its arms outstretched, and rapidly parting them to suck in a flying
insect even plausible?
We know of many examples of feeding by sucking in the fluid surrounding prey,
when the fluid i
Why can't a similar method work with air? it would give "half a wing" some use,
and could then easily become a gliding surface.
--- On Thu, 9/4/08, Jaime A. Headden <firstname.lastname@example.org> wrote:
> From: Jaime A. Headden <email@example.com>
> Subject: Re: Campbell's even crazier than a MANIAC? (archeopteryx climbing)
> To: firstname.lastname@example.org
> Cc: email@example.com
> Date: Thursday, September 4, 2008, 2:05 PM
> Erik Boehm wrote:
> <I think the perching adaptation that birds have is only
> of use once a minimum proficiency in precision flight is
> attained, and for the first examples of therepod flight, the
> absence of a reversed toe for perching probably is
> irrelevant in the arboreal vs cursorial