>sorry lost the end of original message now to complete it

>>Date: Thu, 10 Jun 1999 20:34:06 -0700
>>I was involved with avian predator prey relationship study during the mid
>fortys in the vicinty of Ann Arbor. This question was discussed in some
>detail and a combination of 2 plausible explanations at the time seem to be
that the
>male/female size difference reduced the hunting competition between the sexs
>in size of prey used to feed the young. There is also the consideration
that the female requires a greater resource base to produce her viable set
of eggs. Again size differences between sexes reduces hunting competition.
This maybe simple simplistic thinking. Bill
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