肥kel asked in 科學及數學生物學 · 1 decade ago

幫我找北極熊o既知料(要英文)

幫我找北極熊o既知料(要英文)

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  • 1 decade ago
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    北極熊,又稱白熊,是在北極圈裡土生土長的熊,牠是陸上最龐大的肉食動物。在牠生存的空間裡,牠是食物鏈最頂層。牠擁有極厚的鯨脂及毛髮來保暖,其白色的外表在雪白的雪地上是良好的保護色,而且牠可以在陸上及海上捕捉食物,因此牠能在北極這種極嚴酷的氣候裡生存。

    The polar bear (Ursus maritimus), also known as the white bear, northern bear, sea bear, ice bear or nanuq in some Inuit languages, is a species of bear that is native to the Arctic and the apex predator within its range. Its thick blubber and fur insulate it against the cold. Its fur, commonly mistaken as white or cream-colored due to the way light refracts within each hair, is translucent, providing camouflage from its prey. The bear has a short tail and small ears that help reduce heat loss, as well as a relatively small head and long, tapered body to streamline it for swimming. The polar bear is a semi-aquatic marine mammal that depends mainly upon the pack ice and the marine food web for survival. It has uniquely adapted for life on a combination of land, sea, and ice and is now dependent on this combination.

    Scientists and climatologists believe that the projected decreases in the polar sea ice due to global warming will have a significant negative impact or even lead to extinction of this species within this century.

    An alternative theory downplays the effect climate change is having on the polar bear and hypothesizes that the species may survive through adaptation.

    北極熊作為最大型的陸上肉食動物,其擁有兩倍於老虎的體積及兩倍於獅子的重量,成年雄性北極熊大約重400至600公斤,最極端的甚至超過800公斤。成年雌性北極熊的體積大約為雄性的一半,而其重量則大約為200至300公斤。成年雄性北極熊大約高2.4至2.6米,而成年雌性北極熊則大約高1.9至2.1米。剛出生的北極熊大約只重600至700克。現存北極熊數量大約為16000至35000隻,其中大約60%活躍於加拿大。

    Polar bears rank with the Kodiak bear as among the largest living land carnivores, and male polar bears may weigh twice as much as a Siberian tiger. There is great sexual dimorphism, with some males reaching more than twice the size of the females. Most adult males weigh 300-600 kg (660-1320 lbs) and measure 2.4-3.0 m (7.9-10.0 ft) in length. Adult females are roughly half the size of males and normally weigh 150-300 kg (330-660 lbs), measuring 1.9-2.1 m (6.25-7 ft).At birth, cubs weigh only 600-700 g or about a pound and a half.

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