Black Bear Information

The American Black Bear (Ursus americanus) is the most common bear species native to North America. It lives throughout much of the continent, from northern Canada and Alaska south into Mexico, from the Atlantic to the Pacific. This includes 41 of the 50 U.S. states and all Canadian provinces except Prince Edward Island. Populations in the east-central and southern United States remain in the protected mountains and woodlands of parks and preserves, though bears will occasionally wander outside the parks' boundaries and have set up new territories, in some cases on the margins of urban environments in recent years as their populations increase. Although there were probably once as many as two million black bears in North America long before European colonization, the population declined to a low of 200,000 as a result of habitat destruction and unrestricted hunting. By current estimates, more than 800,000 are living today on the continent.

The American Black Bear usually ranges in length from 150 to 180 cm (59 to 72 inches) and typically stands about 80 to 95 cm (34 to 48 inches) at the shoulder. Standing up on its hind feet, a black bear can be up to 7 feet tall. Males are 33% larger than females. Females weigh between 40 and 180 kg (90 and 400 pounds); males weigh between 115 and 275 kg (250 and 600 pounds) . Adult black bears seldom exceed 300 kg (660 pounds) but exceptionally large males have been recorded from the wild at up to 240 cm (95 inches) long and at least 365 kg (800 pounds). The biggest American black bear ever recorded was a male from North Carolina that weighed 880 lbs (400 kilograms). Cubs usually weigh 200 to 450 g (between 7 ounces and 1 pound) at birth. The adult has small eyes, rounded ears, a long snout, a large body, and a short tail. It has an excellent sense of smell. Though they generally have shaggy black hair, the coat can vary in color from white through chocolate-brown, cinnamon-brown and blonde (found mostly west of the Mississippi River), to black in the east (the same is generally true in Canada, the border being between Manitoba and Ontario). They occasionally have a slight V-shaped white chest blaze. The tail is 4.8 inches long.

Although black bears can stand and walk on their hind legs it is more normal for them to walk on all fours. When they do stand, it is usually to get a better scent or to look at something. Their characteristic shuffling gait results from their plantigrade (flat-footed) walk, with the hind legs slightly longer than the forelegs. Another reason for the apparent shuffle is that they commonly walk with a pacing gait. Unlike many quadrupeds, the legs on one side move together instead of alternating, much like a pacer horse.Each paw has five long, strong claws used for tearing, digging, and climbing.

Black bears are found in a wide variety of habitats across their range. They prefer forested and shrubby areas but they are also known to live on ridgetops, in tidelands, burned areas, riparian areas, agricultural fields and, sometimes, avalanche chutes. Black bears can be found from hardwood and conifer swamps to the rather dry sage and pinyon-juniper habitats in the western states. Black bears typically "hibernate" during winter in hollowed-out dens in tree cavities, under logs or rocks, in banks, caves, or culverts, and in shallow depressions. Dens are normally not reused from one year to the next. While they do not eat, drink, defecate, or urinate during hibernation, it is not the true hibernation of smaller mammals since their body temperature does not drop significantly and they remain somewhat alert and active. Females give birth and nurse their young while hibernating.

After emerging from their winter dens in spring, they seek carrion from winter-killed animals and new shoots of many plant species, especially wetland plants. In mountainous areas, they seek southerly slopes at lower elevations for forage and move to northerly and easterly slopes at higher elevations as summer progresses. Black bears use dense cover for hiding and thermal protection, as well as for bedding. They climb trees to escape danger and use forested areas and rivers as travel corridors.

Females generally reach breeding maturity at 3 to 4 years of age and with adequate nutrition can breed every 2 years. In poor quality habitat, they may not mature until 5-7 and may skip breeding cycles. Males are sexually mature at same age, but may not become large enough to win breeding rights until they are 4-5 years old (they have to be large enough to win fights with other males and be accepted by females). Mating is generally during summer, from Mid-June to mid-August with some variation depending on latitude, but with embryonic diapause, the embryos do not begin to develop until the mother dens in the fall to hibernate through the winter months. Because of this delay, gestation can be 7 to 8 months, but actual development takes about 60 days. However, if food was scarce and the mother has not gained enough fat to sustain herself during hibernation as well as produce and feed cubs, the embryos do not develop.

The cubs are generally born in January or February. They are very small, about 10-14 ounces, and are blind, nearly hairless, and helpless when born. Two to three cubs are most common, though up to four and even five cubs has been documented. First-time mothers typically have only a single cub. The mother nurses the cubs with rich milk, and by spring thaw, when the bears start leaving their dens, the cubs are fur-balls of energy, inquisitive and playful. By this time they are about 4 to 8 pounds (2-4 kg). When their mother senses danger, she grunts to the cubs to climb high up a tree. They are weaned between July and September of their first year and stay with the mother through the first winter. The cubs become independent during their second summer (when they are 1.5 years old). At this time, the sow goes into estrus again.

Cub survival is totally dependent on the skill of the mother in teaching her cubs what to eat, where and how to forage, where to den, and when and where to seek shelter from heat or danger.

Black bears are omnivores whose diet includes both plants and meat. They are apex predators in North America, with the exception of areas where they coexist with the brown bear. The black bear eats a wide variety of foods, mainly herbs, nuts and berries. In the state of Washington, black bears eat a large amount of skunk cabbage, horsetail and tree bark during the spring.They also commonly feed on spring acorns in Massachusetts.

They also feed on carrion and insects (mainly for the larvae) such as carpenter ants, yellow jackets, bees, wasps and termites. They do raid bees' nests for honey, but more importantly for the bee larvae which are an easy source of protein. They also kill and eat small mammals (such as rodents) and ungulates, mostly the young. In Michigan and the state of New York, black bears have preyed on white-tailed deer fawns. In addition they have been recorded preying on elk calves in Idaho and moose calves in Alaska

Additionally, black bears will eat salmon, suckers, alligator eggs, crayfish, and trout and will seek out food within orchards, beehives, and agricultural croplands. They may frequent garbage dumps or appropriate food from the trash bins of businesses or private homes.

Black bears often drag their prey to cover, preferring to feed in seclusion and frequently begin feeding on the udder of lactating females, but generally prefer meat from the viscera. The skin of large prey is stripped back and turned inside out with the skeleton usually left largely intact. Unlike wolves and coyotes, black bears rarely scatter the remains of their kills. Vegetation around the carcass is usually matted down by black bears and their droppings are frequently found nearby. Black bears may attempt to cover remains of larger carcasses, though they do not do so with the same frequency as cougars and grizzly bears

Like many animals, they seldom attack unless cornered, threatened, or wounded. They are less likely to attack humans than grizzly bears and typically flee for cover as soon as they identify a human visitor. Deaths by grizzlies are most often defensive, while black bear fatalities on humans, although extremely rare, are often predatory. This makes feigning death when a black bear attacks ineffective. Although 14 North Americans have been killed since the year 2000, it is estimated that there have been only 56 documented killings of humans by black bears in North America in the past 100 years.

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