- From: Bmitch <bmitch@xxxxxxxxxxx>
- Date: Fri, 3 Feb 2006 04:47:11 GMT
Deja Fu wrote:
If the hawks were surfing, they would have been
in the wake of the vehicle. One doesn't "surf"
on the (very minimal and far too close) 'compression
wave' of a speedboat or any other moving object...
Somebody should tell the dolphins then.
Speedboats plane over the surface of the water and so don't create a
displacement --or bow-- wave. Trucks and cars don't plane on the air so
they do create a displacement wave in front and a corresponding negative
pressure behind. It is air moving into that negative pressure area which
pushes Hondas along. It seems quite reasonable to me that birds could
ride the displacement wave of a moving car, though I do wonder if they
could do so at 80mph. Driving a van through narrow high-banked lanes at
about 30mph I frequently have small birds flying just ahead of me for
several seconds before they veer off. They could easily get out of the
path if they needed to.
You don't see Hondas floating in front of trucks
to save gas, but you do see them being sucked
along behind them. To accept this hypothesis, you'd
also have to explain all the dead crows that didn't
lift off the roadkill soon enough. Maybe they're
just not "compression wave surfer crows"...
To surf on a wave you have to be already moving in the same direction
and be picked up by it. Can't do it from a standing start.
If this actually happened, a strong tail wind through
the canyon might explain it. It also might explain
how a weasel on a skateboard could reach 80mph
That said, hawks simply don't run along the ground
with vehicles or other moving objects. It's not
in their nature to play tag like that...
But it's not in the assumed nature that the thread is about.
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