Males compete with each other for breeding opportunities and seek females each year. Grizzlies should live to be 15 to 20 years of age, and a few survive for up to 30 years. Of course, with expanding human populations and diminishing secure habitat, a bear's life span continues to be limited below what one should biologically expect from the species. They have concave faces, a hump on their back, and long claws.
Female Grizzlies first reproduce when they reach 5 to 8 years of age. At that time, implantation only happens if she has enough body fat to carry her pregnancy through hibernation. Including this delay, the gestation period lasts 6 to 9 months.
Litters can have up to 4 cubs, though they are usually of 2 or 3. Mothers stay with their cubs for about 3 years, avoiding male Grizzlies during this time. As a result, females only reproduce every 3 to 5 years. This may seem intuitive but the safest way to interact with a bear, for both you and the bear, is to avoid doing so. The classic grizzly bear image of a massive golden brown bear is a reality, yet, on the eastern slopes of the Alberta Rookies for example, a mature grizzly bear can be as little as lbs in the spring, smaller than area black bears!
Grizzly front claws can be up to 4-inches in length, claws as long as human fingers! It is highly advisable you avoid these. The grizzly bear hump is actually a large muscle. The most identifiable trait of a grizzly bear is the large hump on their shoulders, a powerful muscle they use to power their forelimbs through their daily routine.
Grizzlies, known to dig more than any other bear species, spend inordinate amounts of time ripping through the earth and tearing apart rotted logs in search of roots, plant bulbs, insects, rodents, and other grubs. The cubs need her protection from predators such as other bears, cougars and wolves. The grizzly cub has the ability to climb trees with ease until it is about a year old.
The mother provides the meals with her foraging and hunting skills. Once the cubs are capable of fending for themselves, the mother will drive them away from her and look to breed again.
By this time the young grizzly weighs between to lbs and is close to the weight of a full grown grizzly bear. A bear's weight is dependent on the abundance of food. As these bears grow in size and strength, their diet will expand as they start to possess the ability to kill larger prey. These male grizzlies will wait until they reach their sexual maturity before they breed, with some mature at 4 years old and others needing as much as 18 more months to reach full adulthood.
In the meantime, they will establish their own territories as they age. One grizzly in captivity lived to be 47 years old.
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