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Sperm retention and delayed implantation are reproductive adaptations, which allow animals to optimize timing of birth and increase individual breeding potential. Such mechanisms are widespread in the animal kingdom. However, among rodent mammals, these mechanisms are only known for murids. In this work, we report the first documented case of multiple broods in a row in a glirid rodent, the Hazel Dormouse. We recorded the production of two litters by the same adult captive female after a single mating session with a male. We discuss the relevance of our findings towards a better understanding of the dormouse’s reproductive biology and its conservation. Future research should clarify the exact mechanisms underlying this phenomenon and establish its frequency in wild populations of this species.

Multiple broods from a single mating in the hazel dormouse ( Muscardinus avellanarius )