The
polar bear
(
Ursus maritimus
) is a large bear which lives in the
Arctic
.
[3]
It has black skin under the white fur. They are strong and fast, and can run as fast as 25 miles (40 km) an hour for a short distance.
[4]
[5]
In 2022, there were around 22,000 polar bears in the world.
[6]
There is an extinct subspecies called
Ursus maritimus tyrannus
.
Polar bear
fur
is made up of a layer of
dense
underfur and an outer layer of "guard hairs", which appear white to tan but are actually
translucent
. The fur keeps them very warm. The skin is not white; it is black. Therefore, they can absorb sunlight efficiently.
[7]
They are strong and can
swim
very well. Polar bears are similar in size to a normal bear but have a slimmer neck, longer legs and fur to keep them warm.
They are mostly
carnivorous
. Polar bears are
apex predators
. They eat mostly
seals
and
fish
. They also eat
sea lions
,
walruses
,
reindeer
,
arctic hares
,
seabirds
, small
whales
,
lemmings
,
crabs
, and
carrion
. When polar bears hunt, they often wait at holes in the ice, where the
seals
come up to
breathe
. They can live off of one seal for many days, but it will make them hungry if they do.
Polar bears live alone.
Young Polar bears stay with their mothers for 1?2 years, and they become
mature
when they are 5?6 years old. People think polar bears can become 25?30 years old in nature, but in captivity (for example, in
zoos
), they can become up to 45 years old.
Polar bears live in countries in the
Arctic Circle
, including these:
The breeding time is 8 months. The babies are born six weeks after their mother mates. At birth, a baby cub weighs less than 2 pounds (0.9 kilograms).
The mother feeds the babies milk, which makes them grow fast, and after 10 weeks, the cubs weigh about 20 to 25 pounds (9.1 to 11.4 kilograms).
Young polar bears wrestle in the snow to build their strength and skills. They practice using their strong paws, and they show off their big, sharp
teeth
.
Mother polar bears will do anything to protect their young. They can kill a predator with just one swat of their powerful front paws. Scientists have even seen a mother polar bear stand up and leap at a
helicopter
to keep it away from her cubs.
During the first year, the cubs begin to eat solid food but still nurse from their mother. They begin to learn to hunt and swim. But they cannot live on their own.
By the time they are two years old, the cubs have grown into large bears. They leave their mother and strike off into
territory
of their own. They hunt and live alone. But they play with other bears they meet.
Polar bears are ready to mate when they are five or six years old. They are adults by this time and weigh 330 to 660 pounds (150 to 300 kilograms).
Both male and female polar bears live to be as much as 30 years old (in a zoo). Polar bears have 42
teeth
.
[4]
As adults, male bears fight with each other over a female each male fluffs out his coat of fur to make himself look bigger. Then, he swaggers along, growling, to scare off his
rival
. Polar bear scientists call this "the cowboy walk."
The polar bear eats seals, fish and fruits (berries).
They can be up to 250 cm long and 160 cm tall and weigh up to 600 kg.
[8]
When two polar bears meet, they have a special way of
greeting
each other. They circle around each other for a while, grunting. Then they come closer and touch
noses
.
The polar bear was the most dangerous animal to hunt. It was also greatly respected for its strength and spirit. The bear's
blubber
, meat, and
fur
all help the
Inuit
survive. The Inuit gave thanks and respect in turn. After a hunt, they held a celebration that lasted for several days. Then, a polar bear
dance
was held. Finally, the bear's
skull
was set on an
ice
floe to release its spirit back into the Arctic.
A polar bear's paws are perfect snowshoes for them. The bottoms are wide and covered with fur to help keep the bear from slipping. The sharp claws help grip the ice.
A polar bear can crawl across
ice
too thin for a human to walk on. They spread out their legs and lay their bellies flat on the ice. Then they use their
claws
to slowly push themselves across the ice.
[9]
Polar bears
mate
in April or May. The cub is born in December, when the mother is
hibernating
. The cub stays in the den with the mother until March, then, they all come out. They eat immediately after hibernating. Sometimes, because of
global warming
, this is impossible and the cubs die before they have had a chance to live. The cub leaves its mother in 2?3 years.
The polar bear's
liver
contains a lot of
vitamin A
.
[10]
Inuit
people knew that eating the liver could cause sickness and death.
[10]
Several groups of European polar explorers were seriously ill after eating livers.
[10]
The symptoms included drowsiness, wanting to sleep, being irritable, headaches, and vomiting. After 24 hours, people's skin began to peel off.
[10]
- ↑
Ingolfsson, Olafur; Wiig, Øystein (16 December 2016). "Late Pleistocene fossil find in Svalbard: the oldest remains of a polar bear (Ursus maritimus Phipps, 1744) ever discovered".
Polar Research
.
28
(3): 455?462.
doi
:
10.1111/j.1751-8369.2008.00087.x
.
S2CID
56292690
.
- ↑
Wiig, Ø.; Amstrup, S.; Atwood, T.; Laidre, K.; Lunn, N.; Obbard, M.; Regehr, E. & Thiemann, G. (2015).
"
Ursus maritimus
"
.
The IUCN Red List of Threatened Species
.
2015
.
IUCN
: e.T22823A14871490.
doi
:
10.2305/IUCN.UK.2015-4.RLTS.T22823A14871490.en
. Retrieved
13 December
2017
.
- ↑
It is about the same size as the
Kodiak bear
- ↑
4.0
4.1
"POLAR BEARS"
.
seaworld.org
. 2008. Archived from
the original
on August 20, 2007
. Retrieved
August 31,
2011
.
42
- ↑
"WWF - Facts about polar bears"
.
wwf.panda.org
. 2011
. Retrieved
August 31,
2011
.
- ↑
https://www.nrk.no/tromsogfinnmark/mener-isbjorn-kan-vaere-utryddet-pa-svalbard-om-50-ar-1.15559199
. Retrieved 1 July 2021
- ↑
Lockwood, pp. 10?16
- ↑
Hannover Zoo:
Polar bear
Archived
2012-07-13 at the
Wayback Machine
, viewed 2012-12-06
- ↑
Cole, Joanna (2000).
The Magic School Bus, Polar Bear Patrol
. U.S.A.
ISBN
978-0-439-31433-6
.
{{
cite book
}}
: CS1 maint: location missing publisher (
link
)
- ↑
10.0
10.1
10.2
10.3
Rodahl, K.; Moore, T. (1943).
"Vitamin A in Bear Liver"
.
The Biochemical Journal
.
37
(2): 166?168.
doi
:
10.1042/bj0370166
.
PMC
1257872
.
PMID
16747610
.