American Black Bear

American Black Bear

Taxobox
name = American Black Bear
fossil range = early Pleistocene- recent
status = LR/lc
status_system = iucn2.3



regnum = Animalia
phylum = Chordata
classis = Mammalia
ordo = Carnivora
familia = Ursidae
genus = "Ursus"
species = "U. americanus"
binomial = "Ursus americanus"
binomial_authority = Pallas, 1780
range_


synonyms = "Euarctos americanus"
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 Alaska south into Mexico and from the Atlantic Ocean to the Pacific Ocean. This includes 41 of the 50 U.S. states, all Canadian provinces except Prince Edward Island, and some of Mexico. Populations in the 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. [http://biology.usgs.gov/s+t/noframe/c286.htmDead link|date=October 2008|date=October 2008] It is a close relative of the Asiatic Black Bear with which it is thought to share a European common ancestor.cite book | author = Macdonald, David | url = http://www.amazon.com/Encyclopedia-Mammals-David-W-Macdonald/dp/0871968711 | title = The Encyclopedia of Mammals: 1| year = 1984 | pages = pp.446 | id = ISBN 0-04-500028-x]

Description

The American Black Bear usually ranges in length from 150 to 180 cm (5 to 6 feet) and typically stands about 76 to 91 cm (2.5 to 3 feet) at the shoulder. [] Standing up on its hind feet, a Black Bear can be up to 7 feet tall (2.12 m). [ [http://whozoo.org/Intro2001/natdavis/JNDavis_blackbear.htm Black Bear: WhoZoo ] ] Males are 33% larger than females.cite book | author = Brown, Gary | title = Great Bear Almanac | year = 1996 | pages = pp.340 | id = ISBN 1558214747] Females weigh between 40 and 180 kg (90 and 400 pounds); males weigh between 115 and 275 kg (250 and 600 pounds) [http://www.sdnhm.org/fieldguide/mammals/ursu-ame.html] . Adult black bears can reach 300 kg (660 pounds) [http://animal.discovery.com/news/afp/20031215/bear.html] , 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 881 lbs (400 kilograms). [ [http://www.helium.com/tm/379331/american-black-lives-north All about the American black bear - Zoology - Helium - by P.H.Rh ] ] 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 (12.12 cm) 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. [ [http://www.zenwaiter.com/blackbearhuntingguidequebec.htm] ] Each paw has five long, strong claws used for tearing, digging, and climbing. When necessary, they can run at speeds up to 30 miles per hour (48 kph) and are good swimmers. [ [http://www.bear.org/website/Bear-Facts/Senses-Abilities.html North American Bear Center - Senses & Abilities ] ] The ears of a black bear are larger and more erect than those of the brown bear, and it lacks a prominent shoulder hump. cite book |last=Kindersley |first= Dorling |year=2001,2005 |title=Animal |location=New York City |publisher=DK Publishing |isbn=0-7894-7764-5]

Ecology and Behavior

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.

Reproduction

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 the 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 have 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 and where to eat, how to forage, where to den, and when and where to seek shelter from heat or danger.

Diet

Black bears are omnivores whose diet includes plants, meat, and insects. 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 and other parts of the Pacific Northwest, black bears eat a large amount of skunk cabbage, horsetail and tree bark during the spring. [Efficacy of Black Bear Supplemental Feeding to Reduce Conifer Damage in Western Washington, Georg J. Ziegltrum, "The Journal of Wildlife Management", Vol. 68, No. 3 (Jul., 2004), pp. 470-474] They also commonly feed on spring acorns in Massachusetts. [Effects of Spring acorn availability on Black Bear diet, milk composition, and cub survival,John E. McDonald Jr.A, B and Todd K. Fuller, "Journal of Mammalogy" Article: pp. 1022–1028]

They feed on carrion and insects (mainly for the larvae) such as carpenter ants, yellow jackets, bees, wasps and termites. They raid beehives for both honey and bee larvae as both are easy sources of carbohydrates (honey) and protein (larvae.) They also kill and eat small mammals (such as rodents) and ungulates, mostly the young. In Michigan [Ozoga, J. J., and R.K Clute. 1988. Mortality rates of marked and unmarked fawns. "Journal of Wildlife Management 52:549-551.] and the state of New York, [Mathews, N. E., and W. F Porter. 1988. Black bear predation on white-tailed deer neonates in the central Adirondacks, "Canadian Journal of Zoology" 66:1241-1242.] black bears prey on white-tailed deer fawns. In addition they have been recorded preying on elk calves in Idaho [Schlegal. M. 1976, Factor affecting calf elk survival in north central Idaho. "Western Association of State Game and Fish Commission" 56:342-355.] and moose calves in Alaska. [Franzmann. A. W. C. C, Schwartz and R.O. Peterson, Moose calf mortality in summer at Kenai Peninsula, Alaska. "Journal of Wildlife Management" 44:764-768]

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 frequently raid garbage dumps, campsites, 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. [http://texnat.tamu.edu/ranchref/predator/bears/t-bears.htm Bear Predation - Description ] ]

Interspecific predatory relationships

In some areas, Black Bears share their range with the Brown Bear. Due to their smaller size, Black Bears are at a competitive disadvantage against Brown Bears in open, non-forested areas. Although displacement of black bears by Brown Bears has been documented, actual interspecific killing of Black Bears by brown bears has only occasionally been reported. The diurnal Black Bear's habit of living in heavily forested areas as opposed to the largely nocturnal brown bear's preference for open spaces usually ensures that the two species avoid confrontations in areas where they are sympatric. [http://www.nrmsc.usgs.gov/products/Predation_Papers.pdfDead link|date=October 2008|date=October 2008]

Black Bears are also sympatric with cougars and may compete with them over carcasses. Like Brown Bears, they will sometimes steal kills from cougars. One study found that both bear species visited 24% of cougar kills in Yellowstone and Glacier National Parks, usurping 10% of carcasses. [cite paper |author=COSEWIC. Canadian Wildlife Service |title=Assessment and Update Status Report on the Grizzly Bear (Ursus arctos) |publisher=Environment Canada |year=2002 |url=http://dsp-psd.pwgsc.gc.ca/Collection/CW69-14-166-2002E.pdf |format=PDF |accessdate=2007-04-08 ] However, Black Bears and cougars rarely engage in violent combat with each other and usually try to scare each other with bluff changes, growls, swipes, etc.

Black Bear interactions with wolves are much rarer than with Brown Bears, due to differences in habitat preferences. The majority of Black Bear encounters with wolves occur in the species' northern range, with no interactions being recorded in Mexico. Wolves have been recorded to kill Black Bears on numerous occasions without eating them. Unlike Brown Bears, Black Bears frequently lose against wolves in disputes over kills.cite book | author= L. David Mech & Luigi Boitani | url = | title=Wolves: Behaviour, Ecology and Conservation | year=2001 | pages= p 448 | id= ISBN 0226516962 ] Black Bears are generally timid and prefer to flee rather than fight.

Relationships with humans


=Livestock and crop da

Livestock depredations by Black Bears occur mostly in spring. A limitation of food sources in early spring and wild berry and nut crop failures during summer months are probably major contributing factors. Black Bears can do extensive damage in some areas of the northwestern states by stripping the bark from trees and feeding on the cambium. [http://texnat.tamu.edu/ranchref/predator/bears/t-bears.htm Bear Predation - Description ] ]

Though Black Bears will attack adult cattle and horses, they seem to prefer sheep, goats, calves, and pigs. They normally kill by biting the neck and shoulders, though they may break the neck or back of prey with blows from the paws. Evidence of a bear attack includes claw marks are being frequently found on the neck, back, and shoulders of these larger animals. Surplus killing of sheep and goats are relatively common. Bears have been known to frighten livestock herds over cliffs, causing injuries and death to many animals; whether or not this is intentional is not known.

Attacks on humans

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 Black Bear, though, are most often predatory, while the more numerous grizzly fatalities on humans are often defensive. [ [http://www.mass.gov/dfwele/dfw/dfw_bear_problem_faqs.htm Black Bear Problems and Control - FAQ] ] This makes feigning death when a Black Bear attacks ineffective. Although 15 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.

History and controversy

Because little of their behavior has been understood until recently, Black Bears have been feared and hated. Before the 20th century, these bears were shot intermittently as vermin, food, and trophies, being seen as either a vicious beast or an endless commodity; until recently, in many areas, bounties were paid for Black Bears. Despite conservationists' demands to the contrary, the bearskin hats made of Black Bear fur are still used by regiments of many nations, including the Queen of England's Foot Guards.

Paradoxically, Black Bears have also been portrayed as harmless and cuddly. For example, the teddy bear owes its existence to a young Black Bear cub Theodore Roosevelt refused to shoot, and Christopher Robin Milne named his teddy Winnie-the-Pooh after Winnipeg, a Black Bear which he and his father often saw at London Zoo. Today, Black Bears are as much an important game species as they are a point of debate across the continent, especially when many bears are finding life in the suburbs quite comfortable. Given their relatively low reproductive rate, Black Bear hunting must be carefully controlled and is probably inappropriate in areas where populations are feeble or where habitat is no longer intact.

Their tendencies to follow their stomachs and habitat encroachment by humans have created human-bear conflicts. This is especially true in areas where they may have been uncommon or absent for a long time, as in many parts of the eastern United States. An excellent example is the state of New Jersey. In New Jersey, now the nation's most densely populated state, bears were quite common before the modern era. Because so much land was cleared for homes and farming and as a result of poor policies regarding hunting and forestry, by 1970 only about 100 bears remained. However, because of changes in land use, management, and bear population increases in neighboring Pennsylvania and New York, that number increased to an estimated 3,529 by 2003. The result is that the residents increasingly encounter bears near their homes and workplaces. Education and precaution are needed, especially in areas such as New Jersey where bear encounters are a fairly new phenomena in recent history. Fear of bear attacks is a common concern for these residents. Attacks can happen when a bear has lost its fear of humans and has come to associate people with food. This is a cause for concern among civilians and scientists alike. Similar events have unfolded in other states and in Canada. The rate of contact between Black Bears in search of food and humans rose to record levels in the western United States in autumn 2007. [cite web|author=Reuters|url=http://www.smh.com.au/news/World/Bear-havoc-at-record-heights-in-US-West/2007/09/25/1190486264789.html|title=Bear havoc at record heights in US West|date=2007-09-25|accessdate=2007-09-25 |work=Sydney Morning Herald] State, provincial, and federal agencies are working to address the issue with trap-and-release programs, limited hunting, and hazing bears with rubber bullets, other aversion techniques, and dogs. In agricultural areas, electric fences have been very effective.

Taxonomy and subspecies ranges

The American Black Bear is classified in the class Mammalia, order Carnivora and family Ursidae. Many subspecies are named, such as the Kermode bear, Cinnamon bear, and Glacier Bear (or American Blue Bear). Currently accepted subspecies (with their respective ranges) include:

Legal status

Today, a major threat to the American Black Bear is poaching, or illegal killing, to supply Asian markets with bear galls, hearts, and paws, considered to have medicinal value in China, Japan, and Korea. The demand for these parts also affects grizzly and polar bears. The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), a treaty among more than 120 nations, provides measures to curb illegal trade in wildlife and wildlife products across international boundaries, helping to protect the Black Bear from poaching. Perpetrators caught poaching or smuggling either item out of the United States or Canada may face very serious legal ramifications, and park rangers within both countries are charged with the protection of the bears under their jurisdictions up to and including arrest.

Black Bears are abundant in most of the western states and in most of Canada, but its presence in the Midwest is uneven by comparison. For example, Ontario is home to about 100,000 bears, with at least as many in neighboring Quebec, while the Upper Midwest has a very healthy population with 30,000 bears in Minnesota alone. In contrast, nearby places like Iowa, Kansas, and Illinois have virtually none. Many Midwestern states have not had a native breeding population of bears since the turn of the 19th century or earlier. [ [http://209.85.215.104/search?q=cache:nGkoNVygtzAJ:www.inhs.uiuc.edu/releases/Buhnerkempe_OutdoorIL_1007.pdf+black+bear%2BIllinois&hl=en&ct=clnk&cd=9&gl=us&client=firefox-a 403 Forbidden ] Dead link|date=October 2008|date=October 2008] [ [http://www.ksr.ku.edu/libres/Mammals_of_Kansas/ursus-amer.html Bears (Family Ursidae) ] ] [http://www.iowadnr.com/wildlife/pdfs/bear%20log%202003%20complete.pdf]

Most populations east of the Mississippi River are seeing a marked, steady increase in population: bears are moving back into places where they typically have been absent for over a century as suitable habitat has returned. In eastern states with heavily wooded areas, populations are growing rapidly; in North Carolina there were 11,000 bears at last count in 2004, Pennsylvania estimates 15,000 bears currently, New Jersey (a heavily urbanized state) estimated 3,529 in 2003, and even tiny Rhode Island has seen evidence of bears moving into areas where they haven't been in decades. The Florida Black Bear has also seen increases in numbers in recent decades; in 2004, the Florida Fish & Wildlife Commission estimated over 2,400 bears were in the state. Unfortunately, not all is well. Continued development may reduce connectivity between the already separated populations in Florida. The Louisiana subspecies continues to be at critically low levels, although several successful reintroduction projects have added bears to new areas of the state.

In Mexico, the indigenous Black Bear population is listed as endangered and is mostly limited to increasingly fragmented habitat in the mountainous northern parts of the country. Individuals from this area seem to have naturally recolonized parts of southern Texas and along the Rio Grande. [http://www.nps.gov/bibe/naturescience/bears.htm88Dead link|date=October 2008|date=October 2008]

In 1992, the U.S. Fish and Wildlife Service listed the Louisiana Black Bear subspecies as "threatened" under the Endangered Species Act, meaning it could be in danger of extinction throughout all or a significant portion of its range in the near future. The American Black Bear is also protected by legislation in the affected states (Louisiana, Mississippi, and Texas), owing to its close resemblance to this subspecies. The Florida Black Bear was denied protection under the Endangered Species Act in 1998 and 2004 due to its adequate protection and management by the State of Florida.

Miscellaneous

* There has been considerable evidence of Black Bear activity that seems to suggest that the population may be extending its range back into historical territories in Ohio, Kentucky, Texas, and other areas where bears were eradicated and have not been present for a considerable amount of time. It is suspected that adolescent males seeking new territory are wandering far and wide, literally hundreds of miles, by following natural and manmade corridors (rivers and highways) back into their ancestral lands. It has generally been recent policy that if the animal does not become a nuisance, is not a danger, or is not in any imminent peril, that it be allowed to exist unmolested and without hindrance. Most cases remain out of the general public's knowledge until there has been a significant human-bear encounter. Note that while dispersing male bears wander far, females generally stay near where they were born. Because of this, although bears may show up in unexpected places, reproducing populations are slower to expand from core areas. [cite news|url=http://www.kypost.com/2004/07/14/bear071404.html|title=Boone County bear still on the lam|author=David Wecker|first=David|last=Wecker|work=The Kentucky Post|publisher=E. W. Scripps Company|date=2004-07-14|archiveurl=http://web.archive.org/web/20070317120729/http://www.kypost.com/2004/07/14/bear071404.html|archivedate=2007-03-17]
* The sports teams of the University of Maine are known as "Black Bears"; it is also the mascot for Baylor University where two bears are kept on campus.
* "Ursus americanus kermodei", commonly known as the spirit bear, is a rare white (not albino) subspecies found in temperate rain forests on the Pacific coast of North America. Native tradition credits these animals with supernatural powers.
* Smokey Bear, mascot of the United States Forest Service is based on an actual Black Bear cub found in New Mexico after a forest fire. The Black Bear is also the state animal for New Mexico.
* In August 2004, several news media outlets [http://news.bbc.co.uk/2/hi/americas/3580626.stm] reported that a wild Black Bear was found passed out after drinking about 36 cans of beer in Baker Lake, Washington, USA. The bear opened a camper's cooler and used its claws and teeth to puncture the cans. It was found the bear selectively opened cans of Rainier Beer and left all but one Busch beer unconsumed.
* The largest Black Bear on record was legally harvested in North Carolina in 1999 and was weighed by the North Carolina Wildlife Resources Commission at 400 kg (880 pounds). It was reported to have been eating hogs from an industrial hog farm.
* The North American Bear Center, located in Ely, Minnesota, is home to the world's largest captive male and female black bears. Ted, the male, weighed 430-453.6 kg (950-1,000 pounds) in the Fall of 2006. [ [http://www.bear.org/website/Ted/How-Big-is-Ted.html North American Bear Center - How Big is Ted? ] ] Honey, the female, weighed 252 kg (555.5 pounds) in the Fall of 2007. [ [http://www.bear.org/website/Honey/ North American Bear Center - Honey's Page ] ] Both bears have a high protein diet.
*Winnie-the-Pooh was named after Winnipeg the Bear an orphaned black bear cub originally from the Canadian township of White River, Ontario. During World War I, the bear was adopted by (then) Lieutenant Harry Colebourn, a member of The Royal Winnipeg Rifles of the Canadian Infantry. It later became the mascot for the company and was moved to London Zoo where it was seen by A. A. Milne and his son.
*The Black Bear, a two-part 2/4 march, is a famous traditional tune played by Pipe bands around the world; it is the traditional march for Scottish soldiers returning to barracks at the end of the day. It is traditionally played at the end of each performance of the Edinburgh Military Tattoo.
*The Black Bear is sometimes pursued by smaller animals. In newspapers on June 11, 2006, the Associated Press ran a photograph from West Milford, New Jersey, of a Black Bear treed by a woman's cat, a 15-pound tomcat named Jack. After she called the cat home, the bear descended from its perch, about 25 feet up in the tree, and ran off.

ee also

*List of fatal bear attacks in North America by decade

References

*
*
* Bears, consulting editor Ian Stirling, Fog City Press, 1993.

External links

* [http://www.bearaware.bc.ca/ Bear Aware British Columbia]
* [http://www.mnh.si.edu/mna/image_info.cfm?species_id=415 Smithsonian National Museum of Natural History species account-Black Bear]
* [http://www.bbcc.org/ Black Bear Conservation Committee]
* [http://www.sinapu.org/Pages/Bears/Bears.htm Black Bears in the Southern Rockies]
* [http://species.fws.gov/species_accounts/bio_bear.html US Fish and Wildlife Service]
* [http://www.bear.org North American Bear Center]
* [http://www.wlbt.com/Global/story.asp?S=4141199&nav=2CSf Black Bears Returning to Mississippi]
* [http://www.thomasoneil.com/species2.php?n=503 Black Bear images] from Alaska.
* [http://www.wildernessutah.com/brain/blackbears.html Wilderness Utah] - handling a black bear encounter
* [http://www.fieldtripearth.org/div_index.xml?id=4 Field Trip Earth] - Field Trip Earth is a conservation education website operated by the North Carolina Zoological Society.
* [http://www.theblueridgehighlander.com/Black-Bears-of-the-Blue-Ridge-Smoky-Mountains/index.html Black Bears of the Blue Ridge Smoky Mountains]


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