Re: How do birds know when to migrate


"Gary" <nope@xxxxxxx> wrote in message
news:8iagc3t121dknjn79vp7omdgqornvoolvo@xxxxxxxxxx
Pose the question at google ===

"How do birds know when to migrate? "

And you'll get such answers as:

"internal clock"
"Inborn behavior or instinct"
"day length"
"they watch the Weather Channel"

In other words, nobody knows. But we all know that birds and other
animals can travel thousands of miles to return to the land of their
birth. How ?

What if the theory of sound activating nerves is true ?

http://www.wired.com/science/discoveries/news/2007/06/nerve_communication

"...According to their controversial theory, electricity is just a
side effect of how nerves really operate: by conducting high-density
waves of pressure that resemble sound reverberating through a
pipe...."

I posted this article a few weeks back but it was not well received.

Sound, traveling across space and time, would answer a lot of life's
mysteries. I'm reminded of the old question -- "if a tree falls in
the forest and no one is there to hear it, does it produce a noise ?"
Maybe there are noises we do not hear and this is the problem with our
failure to understand it.
======================================================

The answer to your question must be: It depends upon one's definition of
"sound" and of "noise".

By my definitions the answer is yes. When a tree falls it does produce
cyclic vibrations, sound waves, in the surrounding environment (assuming
the surrounding environment is not a total vacuum as in outer space). Far
as I'm concerned the tree has produced "sound". Totally inanimate
devices, such as a seisemiograph, can collect evidence of these waves even
if the ear of no living creature was present to "hear" them.

Now . .. if one's definition of Sound is the effect that the waves have
on the human (and only the human) ear then, obviously, the tree did not
produce any "Sound".....

The same facts are true regarding "noise". You're dealing here with
mechanical vibrations

When you go really deep into what some have called "Wave Theory" there
becomes something of a "blur" between electromagnetic (radio)waves,
physical/mechanical (sound) waves, and light waves. Certainly there are
some overlaps in the frequency of these different types. There probably
remains more that is "unknown" about the subject than is "known". You're
getting down into sub, and sub-sub-, atomic particles now. Even Einstein
admitted he didn't know a lot about that stuff.

I don't either but I'm willing to give you what info. I have at the moment.
<chuckle>

McDave; Engaging in Almost Lifelike Activities in McMaryland
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