Wayne (@00254) • Hey

The polar bear is a hypercarnivorous species of bear.

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Polar bears maintain their core body temperature at about 36.9 °C (98 °F).
Polar bears have a 5–10 cm (2.0–3.9 in) thick layer of fat underneath the skin, which provides both warmth and energy.
The skin, including the nose and lips, is black and absorbs heat.
After emerging from the water, the bear can easily shake itself dry before freezing since the hairs are resistant to tangling when wet.
Their light fur provides camouflage in their snowy environment.
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This is reversed after they moult. It can also be grayish or brownish.
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Polar bears gain a yellowish colouration as they are exposed more to the sun.
The fur appears white due to the backscatter of incident light and the absence of pigment.
The transparent guard hairs forward scatter ultraviolet light between the underfur and the skin, leading to a cycle of absorption and re-emission, keeping them warm.
which allows the animals to trap heat and float in the water.
The outer surface of the hairs has a scaly appearance, and the guard hairs are hollow,
Males have long hairs on their forelegs, which is thought to signal their fitness to females.
The coat consists of dense underfur around 5 cm (2.0 in) long and guard hairs around 15 cm (5.9 in) long.
The claws are small but sharp and hooked and are used both to snatch prey and climb onto ice.
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The feet are hairier than in other bear species, providing warmth and friction when stepping on snow and sea ice.
Polar bears have large paws, with the front paws being broader than the back.
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Since it normally preys on animals much smaller than it, the polar bear does not have a particularly strong bite.
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The species has a large space or diastema between the canines and cheek teeth, which may allow it to better bite into prey.
The teeth are adapted for a more carnivorous diet than that of the brown bear, having longer, sharper and more spaced out canines, and smaller, more pointed cheek teeth (premolars and molars).
They have 34–42 teeth including 12 incisors, 4 canines, 8–16 premolars and 10 molars.
The snout profile is curved, resembling a "Roman nose".
Compared with the brown bear, this species has a more slender build, with a narrower, flatter and smaller skull, a longer neck, and a lower shoulder hump.
The largest polar bear on record, reportedly weighing 1,002 kg (2,209 lb), was a male shot at Kotzebue Sound in northwestern Alaska in 1960.
The tail is 76–126 mm (3.0–5.0 in) long.
Adults may stand 130–160 cm (4.3–5.2 ft) tall at the shoulder.
A fattened, pregnant female can weigh as much as 500 kg (1,100 lb).
as they can bulk up on fat and increase their mass by 50 percent.
The weight of polar bears fluctuates during the year,
Male polar bears also have proportionally larger heads than females.
Sexual dimorphism in the species is particularly high compared with most other mammals.
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Females are smaller at 180–200 cm (5.9–6.6 ft) with a weight of 150–300 kg (330–660 lb).
Males are generally 200–250 cm (6.6–8.2 ft) long with a weight of 300–800 kg (660–1,760 lb).
though some brown bear subspecies like the Kodiak bear can rival it in size.
The polar bear is the largest living species of bear and land carnivore,
The polar bear's thicker coat is the result of more copies of genes involved in keratin-creating proteins.
an enzyme that breaks down starch, and more selection for genes for fatty acid breakdown and a more efficient circulatory system.
With its carnivorous, high-fat diet the species has fewer copies of the gene involved in making amylase,
a result of there being fewer odours in their Arctic habitat.
Polar bears have a less diverse array of olfactory receptor genes,
Analysis of the number of variations of gene copies in polar bears compared with brown bears and American black bears shows distinct adaptions.
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