Originally Posted by Delapool
Handy info - I wonder why. I assume this all for survival but would of thought males would be more common in nature.
Well, the ability of storing sperm packets is a survival strategy in free nature. In case there are no males anymore or a lack of males within the colony, this ensures to get the population going on. For a certain number of ovoviviparous livebearer species occur in preditory waters and therefore a number of these livebearers will be eaten. And as long as there are surviving females that are storing sperm packets, they can still reproduce themselves and the colony will survive.