Bears don't want to attack people. We kill them far more often than they kill us, and many bears seem to be aware of that ratio. When they do attack, it's usually because they were either starved or startled.
Brown bears (aka grizzly bears) are the most widespread bear species in the world, found across much of Eurasia and northwestern North America. They're generally bigger and more aggressive than black bears, but color alone isn't a reliable way to tell them apart. Notice the bear's size, too, and look for a hump of muscles in its upper back, a trademark of brown bears. Also remember where you are — grizzly country is expansive in Europe, Asia and Canada, but in the U.S. it's limited to Alaska and parts of Idaho, Montana, Washington and Wyoming.
If you encounter a brown bear, keep these tips in mind:
Always carry bear spray. This is a must-have in grizzly country, preferably in a holster or front pocket since you'll just have a few seconds to fire. (Bear spray can actually be more useful than a gun for grizzlies, since one or two bullets may not stop a full-grown adult quickly enough.)
Don't be stealthy. If you think bears are in the area, talk, sing or make other noises to let them know you're there, too — without surprising them. If you see a bear that doesn't see you, don't disturb it.
Don't be a tease. Unattended food and trash are surefire bear magnets, even if they're tied up. Try to produce minimal waste when camping or hiking, and secure all food and trash carefully (bear canisters are required in some parks). Bears can also be lured by dogs, so it may be wise to leave pets at home.
Don't run. If you do meet a grizzly, stand tall, stay calm and slowly reach for your bear spray. Don't worry if the bear stands up — that usually just means it's curious. Back away slowly if you can, still ready to spray. If the bear follows you, stop and stand your ground.
Aim and spray. The best distance to spray a charging bear is about 40 to 50 feet. The idea is to create a wall of pepper spray between you and the bear.
Hit the dirt. If the bear keeps charging, fall down and lace your fingers over the back of your neck to protect it. Guard your stomach by lying flat on the ground or by assuming a fetal position, with knees tucked under your chin. Don't move.