How long does it take for a grizzly bear to produce its offspring?

Grizzly bears have a gestation period of about 6 to 8 months. After mating, fertilized eggs undergo a process called delayed implantation, which allows the bear to control the timing of pregnancy. Cubs are typically born in January or February while the mother is in her den, and they usually stay with her for about 1.5 to 2.5 years before becoming independent.