Re: Newbie Questions

On Oct 10, 10:59 pm, Bill Morse <wdNOSPAmo...@xxxxxxxxxxxxxxxx> wrote:
scenario_dave wrote:
On Oct 9, 6:34 pm, Vend <ven...@xxxxxxxxxxx> wrote:
On 9 Ott, 23:59, John Harshman <jharshman.diespam...@xxxxxxxxxxx>
wrote:

Vend wrote:
On 9 Ott, 21:42, John Harshman <jharshman.diespam...@xxxxxxxxxxx>
wrote:

J.J. O'Shea wrote:

On Tue, 9 Oct 2007 14:10:13 -0400, John Harshman wrote
(in article <9uPOi.5358$4V6.3...@xxxxxxxxxxxxxxxxxxxxxxxxxx>):

Greg Esres wrote:

Greg G. wrote:

<<Man evolved in a hot area and specialized in running so rapid
cooling
was required.>>

Yet other mammals in the depths of Africa, who likely do a lot
more running that we did, still have a healthy coat of hair?

Different heat strokes for different folks. Some of those hairy
animals don't sweat, or sweat only through a few bare patches. They
deal with heat loss in other ways, like panting. Anyway, what
animals do a lot more running than we did? Or that may not be the
explanation. The real answer is "we don't know".

None in Africa with the possible exception of African Hunting Dogs.

Who don't sweat. Viola!

How do they avoid overheating?

Panting, like any dog.

But human also pant during exercise, yet this isn't sufficient to
prevent overheating.
What makes canine panting more efficient?

I heard that lions are also long distance runners. Do they sweat?

They are not long distance runners. You were misinformed. If they are
like most cats, they sweat through their noses and the soles of their
feet only.

Thanks- Hide quoted text -

- Show quoted text -

Dogs do overheat. They hunt in packs. A few chase the prey at a
quick pace while the others follow more slowly. When the first ones
start wearing down another set runs up to take their places while the
first ones rest. The dogs can run in fairly small bursts because
different dogs are running at full speed at different times but the
prey has to run constantly. Most of the dogs spend most of their time
jogging fairly slowly. Eventually the prey is exhausted and stops to
fight and the entire pack attacks the exhusted and wounded animal.
This is when they are hunting prey much larger than themselves.

Dogs are probably more efficient than cats at giving off heat but
because they hunt in packs they don't have to be as efficient as you'd
think.

Let's think about this for a minute. If a few chase the prey at a quick pace
while the others follow more slowly, the others will be well behind. They
may run up to take the place of the leaders, but in doing so will use up
the same amount of energy as the leaders used in the initial rapid chase.
The only way I can see for a pack chase to work is if there are advantages
in drafting (similar to bicycle races) or if some of the pack members drop
out of the chase over time (the pack is using up the anaerobic capacity of
some of the pack members to raise the overall rate of the chase). I don't
know which of these is true for wolves, or if I am missing some other
factor.

--
Yours, Bill Morse- Hide quoted text -

- Show quoted text -

Running along doesn't take as much energy as actively harrasing the
animal. The wolves who are actively attackng the prey have to run in
and bite and then run out quickly enough to avoid getting hurt. The
animals not activively hunting the animal can just lope along.

So it goes, the prey runs then stops to catch its breath, some wolves
run in to harass the prey and make it start running again, then the
prey stops running again and a different set of wolves run in. The
prey is constantly running but the wolves who run slower catch up
when the prey stops running to catch its breath but don't have to
participate in harrasing the animal.

.

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