In article ,
"Pete Lynn" wrote:

I have heard that in tight social groupings, menstruations fall into
phase with the alpha female, do not ask me how that works.

Demonstrated during the 80's or early 90's to be the result of
pheromones - I saw a cite recently (probably when I did the National
Institutes of Health Medline query I quoted above) but I can't remember
specifics.

Though it
might promote monogamy and encourage all the men to go off hunting once
a month. Hunting, fishing, etc., is effected by the moon... Also, in
the old days, a full moon enabled a degree of nocturnal behaviour.
Conceivably, all sorts of weird moon related evolutionary mechanisms
might occur, it beats me.

One of the more interesting (and obscure) effects is how lunar cycles
affect the spawning of coral polyps - on a given reef, they all spawn at
the same time in phase-lock with the moon, despite many being too deep
for the moon's light to penetrate much at all, despite at least half
being shaded from the moon completely, despite local cloud cover, etc.

--
Herb Schaltegger, B.S., J.D.
"Never underestimate the power of human stupidity."
~ Robert A. Heinlein
http://www.angryherb.net