Perhaps no other animal has so excited the human
imagination as the bear. References to bears are found
in literature, folk songs, legends, mythology, fairy
tales, and cartoons.
The American black bear
inhabits wooded and mountainous areas throughout most
of North America, from Alaska to Florida, Canada to
Mexico.
The black bear is approximately 5 feet
long and varies in weight from 125 to 400 pounds. It
has small eyes, rounded ears, a long snout, a large
body, and a short tail. The shaggy hair varies in
color from white through chocolate brown, cinnamon
brown, and blonde to black, but most black bears are
indeed black or a darker shade of brown.
While
black bears are capable of standing and walking on
their hind legs, the usual posture is on all fours.
The black bear's characteristic shuffle results from
walking flat-footed, with the hind legs slightly
longer than the front legs. Each paw has five strong,
non-retractable claws used for tearing, digging, and
climbing. One blow from a powerful front paw is enough
to kill an adult deer. But in spite of their size and
strength, black bears are surprisingly agile and
careful in their movements.
Although much of
its historical habitat has been destroyed by axe,
plow, and bulldozer, the highly intelligent black bear
has adapted and survived. Black bears are
opportunistic feeders, making use of just about any
available food source. While they prefer berries,
nuts, grass, and other plants, they also eat carrion,
small animals, and fish.
When fall approaches,
black bears must eat large amounts of food in order to
gain enough weight to sustain them through their
winter hibernation, when they survive on their
reserves of body fat. During periods of relatively
warm weather, they may awaken and take short
excursions outside.
Black bears reach breeding
maturity at about 4 or 5 years of age, and breed every
2 to 3 years. Black bears breed in the spring, usually
in May and June, but the embryos do not begin to
develop until the mother dens in the fall to hibernate
through the winter months. However, if food was scarce
and the mother has not gained enough fat to sustain
herself during hibernation as well as produce cubs,
the embryos do not develop.
Black bear cubs are
generally born in January or February. Cubs are blind
at birth, and twins are most common. By spring thaw,
when the bears start leaving their dens, the cubs are
fur-balls of energy, inquisitive and playful. They are
weaned between July and September of their first year,
and stay with the mother through the first full
winter. They are usually independent by the second
winter.
Cub survival is totally dependent on
the skill of the mother in teaching her cubs what to
eat, where and how to forage (find food), where to
den, and when and where to seek shelter from heat or
danger.
Except for breeding and raising young,
black bears are generally solitary animals. They try
to avoid humans and are considered non-aggressive
except when injured, protecting their young, or
protecting themselves. Daily movements are influenced
greatly by temperature and food availability. Bears
usually feed in the cool of the evening or early
morning. During the heat of the day, they will seek
shade in dense underbrush. Home ranges are determined
by food types, abundance, and availability, and can be
as small as 1 square mile or as great as 100 square
miles.
Rugged terrain and dense shrubs provide
escape cover and den sites for black bears. Black
bears also seek den sites under fallen trees, in
hollow trees or caves, or in previously occupied dens.
They are excellent tree climbers, and will use trees
to escape from danger. When possible, black bears will
choose streams with dense bankside shrubbery as travel
corridors to and from food sources.
The black
bear's primary predator is man. During the American
colonial period and after, black bears were hunted
almost to extinction on the East Coast. Many states
paid bounties for bears, and as late as 1977, there
was still a bounty law on the books in Highland
County, Virginia (even though it had been more than 30
years since the last bounty was paid).
In
addition to the historical uncontrolled harvest
encouraged by bounties, black bear numbers were
reduced by timber harvesting and burning, clearing
land for crops and grazing, and other encroachments
associated with an expanding civilization. By the
early 1900s, the once-numerous black bear could be
found only in remote mountainous areas of Georgia,
Kentucky, Maryland, North Carolina, Pennsylvania,
Tennessee, Virginia, and West Virginia.
As
small farms failed and people moved back to the
cities, bear habitat slowly recovered and populations
started to increase. The early establishment of
national parks and national forests in the East helped
save the black bear in that region.
Although
attitudes concerning bears and other game animals were
changing and wildlife laws protecting black bears and
other animals were being enacted, the understanding of
black bear biology, behavior, and habitat requirements
remained incomplete. It wasn't until the 1960s that
methods and techniques for safely trapping,
immobilizing, and handling such powerful animals were
developed. More has been learned about the habits and
needs of the black bear in the last 30 years than in
all of recorded history.
Thanks to this new
knowledge and understanding, and better management,
black bear populations have recovered significantly.
However, they are not out of danger.
Today, a
major threat to the American black bear is widespread
poaching, or illegal killing, to supply Asian markets
with bear gall bladders 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 (also known as 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. The
U.S. Fish and Wildlife Service is the agency
responsible for the U.S. government's compliance with
the CITES treaty.
Two subspecies found in the
southeastern U.S., the Louisiana black bear and the
Florida black bear, still face decline mainly due to
habitat loss and degradation.