We compared females that had access to a mate during their reproductive receptive period to females that relied exclusively on stored sperm to produce a brood. We kept each female isolated; half were provided with a male so that they could at least have the option to mate. Half were kept alone, so to produce a brood they would have to rely on stored sperm. We then measured the length of the babies, recorded how many babies each female had per brood, and noted how often females failed to produce broods.
To the right is a photograph of a single brood one week after they were born.