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Re: Microraptor also ate fish
On Tue, Apr 30, 2013 12:55 AM EDT Mike Keesey wrote:
>> Mortimer wrote: [ … ] their time in trees? How strict/misleading are the
>> osteological correlates we look for, basically.
>Right, this stuff would be very interesting to know.
I agree, but likely it is not knowable - what an animal is doing can over-ride
time as a driver of morphology - as example, an animal that forages for lizards
in the terminal branch environment would likely show evidence of that in the
pedal extremities, even in the case where a small portion of it's day was spent
However, M. gallopavo spends the night hours in trees, but forages, nests, and
mates on the ground.
As a result, a paleontologist examining a turkey skeleton would look at the
foot and conclude that this bird was losing it's ancestral hallux because it
was a cursorial ground dweller.
And excepting that turkeys spend about half their lives in trees, he or she
would be correct.
This the significance of the ground foraging, tree roosting (or sheltering, if
preferred) lifestyle to the evolution of birdness - beyond the basic ability to
climb a tree combined with a cursorial foot, it might leave no obvious mark on
the skeleton, particularly if *all* foraging and nesting was done on the
This in turn refutes the claim that a trees down path to powered flight in
birds can be ruled out due to the lack of obvious arboreal adaptations (e.g.,
the opposable hallux) in pre-birds.