Bernard Lischer wrote:

>  Seasonality and brevity
>of lactation, whether or not the calf has nursed, and whether or not calves
>were killed preferentially (wich I question as a rule) are a few of the
>factors that enter into this.

I don't see why they would kill calves. They are scrawny. Our ancestors
weren't dumb. They knew that if they left it alone then a couple years
later they'd find it again and it would be worth killing. I also wouldn't
be surprised if they preferred males, knowing that by leaving the females
alone they could raise the calves and there'd be more for later.

Don.