• Females have delayed implantation: mating occurs in summer, but the embryo begins to develop only in winter when conditions are favourable.
• In wolverines, embryonic development begins 7–8 months after fertilization, and kits are born after 30–40 days of effective gestation, usually in February or March.

The beaver eater is a terrestrial species that inhabits and develops on land, away from bodies of water, and its young develop in nests built on or near the ground, specifically within underground dens where the nest is hidden; gestation lasts 1 month and 1 week, resulting in a litter of 2 to 4 young that are born live on land, not hatched from eggs or larvae. The female gives birth to the young once every two or three years, and they appear in winter or spring; the mother feeds them milk and teaches them how to hunt, while she is the only parent exhibiting parental care. The interval between reproduction ranges from 1 year and 9 months to 3 years, and the species reaches maturity from 2 to 3 years.