delayed implantation
Quick Summary
Delayed implantation is a phenomenon where an embryo's development is temporarily halted, significantly extending the gestation period. This process is observed in various mammals, including certain carnivores like martens and badgers, as well as some rodents. For instance, in the European badger, after breeding in summer, the embryo develops for a short period before entering dormancy. Implantation occurs months later, in January, with birth in March. This means that out of a total gestation of 250 days, active embryonic growth only happens for about 50 days. Delayed implantation can also occur in species that become pregnant while still nursing a litter. This contrasts with diapause in other animals, like insects, which is a broader term for suspended development in response to adverse environmental conditions.12
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