My thoughts on mass breeding in nature (that would be standard operating procedure in the wild) is that when there is sexual dimorphism with females being much larger than males. Group breeding with multiple males is the norm in the wild. Two examples that come to mind would be Anacondas and Garter Snakes. Coincidentally, both are live bearing (viviparous). I believe some pit vipers behave in the same manner.
I've done colonial (mass male) breeding with Elaphe bimaculata years ago and had good results.
jsc
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"As hard as I've tried, just can't NOT do this"
John Crickmer

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