Grizzly bears are omnivorous and eat a variety of plants and animals, including berries, nuts, fish, and small mammals. Cubs are born with a small amount of body fat and must rely on their mother's milk for nourishment. As they grow older, they will begin to eat solid foods. By the time they are weaned at around 18 months of age, they will be able to eat the same foods as their mother.
Grizzly bear cubs are born blind and helpless, and weigh only about 1 pound (0.45 kilograms). They rely on their mother for everything, including food, warmth, and protection. The mother bear will stay with her cubs in the den for several months, and will nurse them until they are able to eat solid foods.
Grizzly bears are very caring mothers, and will go to great lengths to protect their cubs. If they feel that their cubs are in danger, they will fiercely defend them. Grizzly bear cubs are typically born in litters of two or three, but sometimes single cubs are born. The cubs will stay with their mother until they are about two and a half years old, at which point they will be able to survive on their own.