I'm sure that part of it has to do with hormonal issues surrounding childbirth.
The question I have is whether or not any of your research showed paternal infanticide. That is, we know that males will kill the offspring of other males, but will they kill their own children under normal conditions?
Of course, there is also the possibility, like many naturalists' reactions to homosexuality among the animals, that they simply cannot conceive of maternal infanticide except to claim that the mother was sick or nuts or "inexperienced." Thus, behaviour that they would call "aggression" were it coming from a father is classified as "stress" when coming from a mother.
Hard to say.
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Rrhain
WWJD? JWRTFM!
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