PAT & TOM LEESON / SCIENCE PHOTO LIBRARY PAT & TOM LEESON / SCIENCE PHOTO LIBRARY
American beaver nursing kits in a lodge. Female American beavers (Castor canadensis) are sexually mature at 2.5 years old. They give birth to one litter of kits per year. The gestation period is about 3 months and the litter normally consists of 4 kits, but up to 8 are possible. All kits are born covered in fur with their eyes open and incisor teeth fully grown. The kits are nursed for 6-10 weeks before gradually learning to eat the same food as the adult beavers.
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