The black bear (Ursus americanus, Fig. 1) is the smallest and most widely distributed of the North American bears. Adults typically weigh 100 to 400 pounds (45 to 182 kg) and measure from 4 to 6 feet (120 to 180 cm) long. Some adult males attain weights of over 600 pounds (270 kg). They are massive and strongly built animals. Black bears east of the Mississippi are predominantly black, but in the Rocky Mountains and westward various shades of brown, cinnamon, and even blond are common. The head is moderately sized with a straight profile and tapering nose. The ears are relatively small, rounded, and erect. The tail is short (3 to 6 inches [8 to 15 cm]) and inconspicuous. Each foot has five curved claws about 1 inch (2.5 cm) long that are non-retractable. Bears walk with a shuffling gait, but can be quite agile and quick when necessary. For short distances, they can run up to 35 miles per hour (56 km/hr). They are quite adept at climbing trees and are good swimmers.

It is important to be able to distinguish between black bears and grizzly/ brown bears (Ursus arctos). The grizzly/brown bear is typically much larger than the black bear, ranging from 400 to 1,300 pounds (180 to 585 kg). Its guard hairs have whitish or silvery tips, giving it a frosted or “grizzly” appearance. Grizzly/brown bears have a pronounced hump over the shoulder; a shortened, often dished face; relatively small ears; and long claws (Fig. 2).

Grizzly (brown) bears are typical of all bears physiologically, behaviorally, and ecologically. They are slow growing and long-lived (20 to 25 years). Their ability to store and use fat for energy makes long denning periods (5 to 7 months) possible. During denning they enter a form of hibernation in which their respiration rate (approximately 1 per minute) and heart rate (as low as 10 beats per minute) are greatly reduced. Their body temperature remains just a few degrees below normal; they do not eat, drink, defecate, or urinate, and their dormancy is continuous for 3 to 7 months. The adaptive value of winter denning relates to survival during inclement weather, when reduced food availability, decreased mobility, and increased energy demands for thermoregulation occur. (more…)

Food gathering is a top priority in the life of grizzly bears. They feed extensively on both vegetation and animal matter. Their claws and front leg muscles are remarkably well adapted to digging for roots, tubers, and corms. They may also dig to capture ground squirrels, marmots, and pocket gophers. Brown bears are strongly attracted to succulent forbs, sedges, and grasses. In spring and early summer they may ingest up to 90 pounds of this high-protein forage per day. Bears gain their fat reserves to endure the 5- to 7-month denning period by feeding on high-energy mast (berries, pine nuts) or salmon. The 2 1/2- to 3-month summer feeding period is particularly crucial for reaching maximum body frame and preparing for the breeding season and winter. (more…)

 

The brown bears of North America have lost considerable range, and are currently restricted to western Canada, Alaska, and the northwestern United States. Their populations are considered secure in Canada and Alaska, but have declined significantly in the lower 48 states. Before settlement, 100,000 brown bears may have ranged south of Canada onto the Great Plains along stream systems such as the Missouri River, and in isolated, small mountain ranges such as the Black Hills of South Dakota. They were scattered rather thinly in Mexico and in the southwestern United States, but may have numbered about 10,000 in California, occupying the broad, rich valleys as well as the mountains. (more…)

Black bear damage to the honey industry is a significant concern. Damage to apiaries in the Peace River area of Alberta was estimated at $200,000 in 1976. Damage incidents in Yosemite National Park were estimated to be as high as $113,197 in 1975, with $96,594 resulting from damage to vehicles in which food was stored. Thirty percent of all trees over 6 inches (15 cm) tall were reported to be damaged by black bears on a 3,360 acre (1,630 ha) parcel in Washington State. In Wisconsin, one female black bear and her cubs caused an estimated $35,000 of damage to apple trees during a two-day period in 1987. In general, black bears can inflict significant economic damage in localized areas.Some states pay for damage caused by black bears. In western states, losses caused by black bears are usually less than 10% of total predation losses, although records are not complete. The extent of claims paid are not high but usually are greater than the license income that state wildlife agencies receive from black bear hunters. Deems and Pursley (1983) listed the states and provinces that pay for black bear depredations.

The capture and translocation of bears can be effective in damage control. Unfortunately, relocation often only moves the problem to another site, and bears have been known to travel great distances to return to a trapping site. The handling process, if done correctly, is itself sufficiently traumatic to teach the bears to avoid humans. Use culvert traps or foot snares to capture bears. (more…)

Brown (grizzly) bears have many unique behaviors that subject them to situations in which they are perceived as a threat to humans or personal property. They are opportunistic feeders that may switch to scavenging human-produced food and garbage if made available, becoming a problem around parks, camp grounds, cottages, suburban areas, and garbage dumps. Bears that are conditioned to human foods become used to the presence of humans and are therefore the most dangerous. (more…)

Although wildlife management concepts have been around, bears and their management have been poorly understood to date. Recent concern for the environment, species preservation, and ecosystem management are only now starting to affect the way we manage grizzly bears (Ursus arctos). By the way, Grizzly bears are the same as brown bears.

The difficulty in understanding brown bear biology, behavior, and ecology may have precluded sufficient change to prevent the ultimate loss of the species south of Canada. Grizzly bears must be managed at the ecosystem level. The size of their ranges and their need for safe corridors between habitat units bring them into increasing conflict with people, and there seems to be little guarantee that people will sufficiently limit their activities and land-use patterns to reduce brown bear damage rates and the consequent need for damage control. Drastic changes may be needed in land-use management, zoning, wilderness designation, timber harvest, mining, real estate development, and range management to preserve the species and still meet damage control needs.