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Re: Yet more on dinosaur quad climbers
On Sat, Jul 13, 2013 8:35 AM EDT David Marjanovic wrote:
>-- The GFTR hypothesis still needs a way to get from gliding to flapping.
As do all trees-down scenarios -- braking motions, ground-based fighting in
it's various forms, Jason's point that even weak flapping would be helpful in
regaining the tree at the end of each forage cycle -- just a few possibles.
Boehm's ridgesoaring deserves more thought, IMO. A GFTR glider living on the
edge of a coastal dune environment seems like a fertile field for rational
speculation to me.
I'm also not sure if a glider rather than a parachuter would really result,
Why not? Extended horizontal reach is a handy talent whether acquiring food or
escaping predation. And incrementally useful.
>why a perching foot or some other such adaptation wouldn't evolve pretty soon
>after selection pressure for roosting set in.
In the absence of conservation by terrestrial foraging, you mean?
>-- Weird shit happens. The argument from personal incredulity is a logical
True! But 10^6 is still 10x more probable than 10^7.
>-- The ability to retract the head into the shell evolved twice independently
>in turtles, and not very soon. *Proganochelys* and *Meiolania*, to mention
>just two, were clearly incapable of any such retraction.
Saw a 25 lb Alligator Snapper charge a dog once -- then it charged me. That
big head and series of forward hops really gets your attention.