تعبير بالانجليزي عن الدب
معلومات عن الدب بالانجليزي
معلومات عن الدب البني بالانجليزي
معلومات عن دب الباندا بالانجليزي
ماذا ياكل الدب القطبي بالانجليزي
تعبير عن حيوان بالانجليزي
معلومات عن الدب القطبي للاطفال
polar bear information
صفات الدب القطبي
الدب القطبي مهدد بالانقراض -
Polar Bear endangere -
أريد موضوع تعبير عن حيوان باللغة الإنجليزية
فقرة بالانجليزية عن حيوان
تقرير عن انقراض الدب القطبي بالانجليزية
موضوع تعبير عن حيوان باللغة الإنجليزية مهم
...
الانجليزية •حيوان مهدد بالانقراضباللغة الانجليزية
•
تعبير عن الدب القطبي بالانجليزي.
ماذا ياكل الدب القطبي بالانجليزي
معلومات عن دب الباندا بالانجليزي
polar bear information
معلومات عن الدب القطبي للاطفال
تعبير عن حيوان بالانجليزي
موضوع عن الدب القطبي
صفات الدب القطبي
ماذا يأكل الدب القطبي
اسم بيت الدب القطبي بالانجليزي
معلومات عن الدب بالانجليزي
معلومات عن الدب البني بالانجليزي
ماذا ياكل الدب القطبي بالانجليزي
polar bear information
معلومات عن دب الباندا بالانجليزي
اين يعيش الدب القطبي بالانجليزي
معلومات عن الدب القطبي للاطفال
تعبير عن حيوان بالانجليزي
موضوع عن الدب القطبي
تعبير عن حيوان بالانجليزي
تعبير عن الاسد بالانجليزي
موضوع عن الارنب بالانجليزي قصير
وصف القطة بالانجليزي
تعبير عن النمر بالانجليزي
تعبير عن الجمل بالانجليزي
تعبير عن حديقة الحيوانات بالانجليزي
تعبير عن الفيل بالانجليزي
معلومات عن الاسد بالانجليزي والعربي
تعبير انجليزي عن حيوانك المفضل |
The Polar Bear Ursus maritimus, also known as polar bear, is
a large, omnivorous, predominantly carnivorous mammal) native to the Arctic
regions. It is, along with the kodiak bear and elephant seal, one of the
largest terrestrial carnivores and is at the top of its food pyramid.
Perfectly adapted to its habitat, the polar bear has a thick
layer of grease and a fur that isolate it from the cold. The white color of its
coat ensures an ideal camouflage on the pack ice and its black skin allows it
to better retain its body heat. Equipped with a short tail and small ears, 1 it
has a relatively small, tapered head and an elongated body, characteristic of its
adaptation to swimming. The polar bear is a semi-aquatic marine mammal2 whose
survival depends mainly on sea ice and marine productivity. It hunts both on
land and in water. Its life expectancy is 15 to 30 years.
This species lives only on the pack ice around the North
Pole, on the edge of the Arctic Ocean. Due to global warming and the upheaval
of this habitat, polar bear populations are globally declining and the species
is considered to be at risk. The polar bear population is estimated to be between
20,000 and 25,000 individuals.
A charismatic animal, the polar bear has a strong cultural
impact on Inuit peoples, who still depend on its hunt to survive. He also
marked the popular culture via some of his representatives like Knut, or art
with the sculpture of polar bear realized by François Pompon.
Size and mass [edit | change the code]
The polar bear is one of the largest living terrestrial
carnivores, along with the kodiak bear and elephant seal. They have a height of
1 to 1.5 m at the withers. Adult males generally weigh between 400 and 600 kg
but can sometimes reach 800 kg for a size of 2 to 3 m long4. The polar bear has
a significant sexual dimorphism: generally twice as small as males, females
weigh 200 to 350 kg and measure 1.8 to 2 meters4. At birth, the bear cubs weigh
only 600 to 700 g. The mass record for a polar bear is currently 1,102 kg6.
The polar bear has quite spectacular weight gain. For
example, in Canada, a female polar bear took more than 400 kg in nine months.
In November, it weighed 92 kg, but in August it was weighed at 505 kg. This is
explained by the seal fat that is eaten in spring6.
Diet[
The lifestyle of the polar bear is very different from that
of its cousin, the brown bear. Despite their recent separation during evolution,
these two species exploit extremely different sources of energy. The brown bear
is terrestrial and most of its diet is vegetable with a supplement of animal
proteins, while the polar bear is the most carnivorous of the ursids. Two
species of seals constitute most of its diet: Phoca hispida, which reaches 60
kg, the largest species in the Arctic and forming its main prey, and Erignathus
barbatus, which can exceed 400 kg. None of these two species of seal are found
in the absence of pack ice, which limits the hunting area of the polar bear, but the polar bear is
opportunistic. Thus, another common prey of the polar bear is the walrus and it
is also capable of catching beluga whales.
إرسال تعليق