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Re: From the ground up flight: anecdote
On 4-Sep-08, at 10:26 PM, Allen Hazen wrote:
IF birds evolved from the trees down - as flight got better, I
to see tree climbing abilities getting worse, as flight would
prefered method of getting up
Um... Why, exactly? If that's the case, why are leopards so adept at
climbing trees as opposed to their smaller, presumably insectivorous
Besides the fact, I'm pretty sure the ancestors of flying birds
missed the 'memo' stating they could only do one or the other, as the
from the ground up & trees down groups argue. The simple fact that
the argument ever started should obviously point out the fact that
they are mutually plausible theories.
I don't know about trees, but I have seen a (domestic) parrot whose
preferred way of getting from the floor to the back of a chair was
sideways up the supporting pole of a floor lamp (grasp pole with
extend upper foot upwards, bring lower foot up close to it, repeat)
to the top of a table, walk across the table, then jump to the chair.
So basically if you increased the distance between the chair & lamp,
you'd have reason to retain both abilities.. You could argue that
once "full-powered-flight" capability is reached, climbing would not
be primarily selected for. That is, of course, assuming, said species
is not perfectly fine in it's existence not progressing to full-flight..