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Exploring the beautiful nature of California
California Nature: Gray Wolf
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Wolves are wild carnivore members of the dog
family (Canidae). They are believed to be ancestors of
the domestic dog, which evolved separately more than 20,000
years ago. Wolves are making a comeback in the Great Lakes,
northern Rockies and Southwestern United States.
There are an estimated 7,000 to 11,200 wolves in
Alaska and more than 5,000 in the lower 48 states. Wolves were once common throughout all of North America but were killed in most
areas of the United States by the mid 1930s. Today their range has been reduced
to Canada and the following portions of the United States: Alaska, Idaho,
Michigan, Minnesota, Montana, Wisconsin and Wyoming. Mexican wolves are found in
New Mexico and Arizona. Thanks to the reintroduction of wolves in 1995, Yellowstone National Park is one
of the most favored places to see and hear wolves in the native habitat.
The most common cause of death for wolves is conflict with
people over livestock losses. Another serious threat is human encroachment into wolf territory, which leads to habitat loss for wolves and their prey species.
Overall, the greatest threat to wolves is people's fear and misunderstanding about the species. Many fairy tales and myths tend to misrepresent wolves as villainous, dangerous creatures.
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Wolf sizes vary with geographic locality. They
range in size from 26" to 38" shoulder height,
39" to 80" in length (tip of nose to end of
tail), and vary in weight from 57 to 130 pounds.
Gray Wolf coats may vary in color from grey to
brown, from white to jet black. Females are slightly smaller
than males, and Mexican Wolves tend to be
smaller than their northern cousins. Coat colors
vary from white to grizzled gray to brown or
black.
Gray wolves live in packs which can vary
in size from 2 to over 15, but are usually from
4 to 7 wolves. The leader of the pack is
normally the strongest male, who often
determines when and where the pack will hunt, as
well as other activities of the pack.
Wolfpacks are formed primarily of family members
and relatives. They may travel more often, and
greater distances than any other terrestrial
animal. The leader of the pack is the alpha.
Their territories may cover from 100 to 260
square miles, depending on the abundance of food
and water. Territories may also overlap,
although wolfpacks very seldom confront one
another. Some wolves leave their packs to become
lone wolves. Loners may start their own packs if
a mate and a vacant area can be found. |
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Gray wolves, like maned and red wolves, mate for life. Usually
only the alpha pair breeds. Pairs mate in the winter and about 9
weeks later 2 to 14 pups are born. Though often only the highest
ranking male and female in a pack will breed, all members of the
pack are involved in raising the young.
At birth, wolf pups cannot see or hear and weigh about one
pound. The pups are weaned at about six weeks. Other females in
the pack help take care of newborn pups. Adult pack members
swallow meat and bring it back to the den for their pups. After
the adults regurgitate the food, the pups have a hearty meal.
Breeding season can vary from January in low
latitudes to April in high latitudes. A wolfpack will alternate
between a stationary phase from spring through summer and a
nomadic phase in autumn and winter. The stationary phase
involves caring for pups at a den or home site. Within 3 to 5
months the young pups are able to travel with the pack.
During summer, most movements are toward or away from the pups,
and adults often travel and hunt alone. By autumn, pups are
capable of traveling extensively with the adults, so until the
next whelping season the pack usually roams as a unit throughout
its territory in search of prey.
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When the young adults reach the age of three, they can either
join the pack or leave to find their own territory. The new
territory can be close by if there is a lot of prey. In some
areas, young adults travel hundreds of miles to find a new
territory.
Wolves communicate through body language, scent marking,
barking, growling and howling. Much of their communication is
about reinforcing the social hierarchy of the pack. When a wolf
wants to show that it is submissive to another wolf, it will
crouch, whimper, tuck in its tail, lick the other wolf's mouth
or roll over on its back.
When a wolf wants to challenge another wolf, it will growl or
lay its ears back on its head. A playful wolf dances and bows.
Wolves bark as a warning. Howling is for long-distance
communication to pull a pack back together and to keep strangers
away.
In the wild, gray wolves live 8-13 years, sometimes more. In
captivity, they live upwards of 15 years.
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Once, the wolf was widespread across most of
North America, but it was hunted ruthlessly and extirpated over
most of its range. Today, the wolf is making a successful
comeback in some of its former habitat due to strong
conservation efforts. The gray wolf plays a vital role in the
health and proper functioning of ecosystems.
Today, gray wolves have populations in Alaska, northern
Michigan, northern Wisconsin, western Montana, northern Idaho,
northeast Oregon and the Yellowstone area of Wyoming. Mexican
wolves, a subspecies of the gray wolf, were reintroduced to
protected parkland in eastern Arizona and southwest New Mexico.
The historic range of the gray wolf covered over two-thirds of
the United States.
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Bats
Bears
Bison
Bobcat
Chipmunks
& Squirrels
Deer & Elk
Feral Horses
Foxes
Gophers
Gray Wolf
Jaguar
Mice & Rats
Mountain Lion
Porcupine
Rabbits
& Hares
Raccoons
River Otter
Sheep
Shrews, Moles,
& Opossum Skunks
Weasels & Minks
Wolverine and Badger |
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