

Polar Bear
Ursus maritimus
🐻
Chordata
Mammalia
Carnivora
Caniformia
Ursidae
Ursus
Ursus maritimus
The Arctic Apex Predator — The Polar Bear is the largest extant bear species and the top predator of the Arctic ecosystem. It is highly adapted to life on sea ice, where it hunts seals for their high fat blubber.
Description
Polar Bear (Ursus maritimus) — The Polar Bear is a marine mammal that evolved from brown bear ancestors roughly 400,000 years ago. It is the largest terrestrial carnivore alive today. Its thick white fur and a layer of fat up to 11 cm thick insulate it against freezing temperatures. It relies on sea ice to hunt seals, primarily ringed and bearded seals, using a method called still-hunting — waiting by a seal’s breathing hole to ambush it. Polar Bears are strong swimmers, capable of covering over 60 km in open water. However, due to rapid Arctic ice loss, they are increasingly forced to travel greater distances for food, making them highly vulnerable to climate change. The polar bear’s diet is one of the most extreme examples of lipid specialization in any terrestrial mammal. Their macronutrient intake is dominated by fat, reflecting both their prey’s composition (mostly seals) and their cold marine habitat.
Quick Facts
Max Mass
Shoulder Height
Standing Height
Length
Diet
Trophic Level
390
1.6
2.4
2.5
kg
m
m
m
Carnivore - Ambush Hunter, Hypercarnivore (70%+ meat), Obligate Carnivore (100% meat), Carnivore - Lipivore
Facultative Lipivore
Hunt History
Indigenous Arctic peoples such as the Inuit, Chukchi, and Sami have hunted Polar Bears for millennia. They used bear meat for food, fur for clothing, and fat for oil and fuel. Hunts were carried out using spears, bows, and later firearms, but were highly ritualized — many Arctic cultures viewed the Polar Bear as a spiritual equal or ancestor.
Earliest Archaeological Evidence of Human Predation:
Zhokhov Island (Siberian Arctic, ~8,000 years ago): Remains of Polar Bears with butchery marks found alongside early Arctic hunting tools.
Point Hope, Alaska (~4,000 years ago): Thule and Paleo-Eskimo sites showing Polar Bear skulls used in ceremonial contexts, with clear evidence of hunting.
Greenlandic Dorset Culture sites (~2,500 years ago): Polar Bear bones found with stone tools, suggesting organized hunting practices.
Time & Range
Extinction Status
Regionally Extinct
Extinction Date
Temporal Range
Region
10000
BP
Late Pleistocene
Arctic
Wiki Link
Fat Analysis
Fatness Profile:
High
Fat %
10
Est. Renderable Fat
39
kg
Targeted Organs
Subcutaneous & visceral (pre-denning)
Adipose Depots
Subcutaneous (pre-denning), visceral; marrow
Preferred Cuts
Subcutaneous fat layer
Hunt Difficulty (x/5)
5
Historical Entries
September 5, 1878
Frederick Schwatka
Carnivore
Summer on King William Land helps make Search Complete
Schwatka explains the Arctic diet. "When first thrown wholly upon a diet of reindeer meat, it seems inadequate to properly nourish the system and there is an apparent weakness and inability to perform severe exertive, fatiguing journeys. But this soon passes away in the course of two or three weeks. Our trip was also our first continued experience with a raw meat diet"
The search of Terror Bay was an extremely difficult one owing to the many long finger-like points that constituted its interig outlines. While only about ten to twelve miles between its bounding capes its contour furnished me with nearly ninety miles of very bad walking, which took seven days to complete. The game (luckily for us) was very plentiful in the neighborhood. On one day alone I saw no less than thirty-four reindeer grazing among the different valleys through which I passed. Colonel Gilder killed five. Without leaving the route of my other duties I killed three. Some had an abundance of substantial food and, better than all, its condition was rapidly improving from the lean stringy quality which characterized our spring supply of venison.
The Arctic reindeer is an awkward clumsy animal, and when trotting along, unless closely pursued, it goes stumbling over the grough ground in a manner that often leads the amateur hunter, (who perchance has risked a long shot at him) into the belief that his fire has been effective. But the reindeer was the most reliable game in which dependence for regular continuous subsistence can be placed. Without the reindeer my expedition of from nineteen to twenty-two souls and forty to fifty dogs could not have accomplished the journey it did, having only about a month's ration when it started at Camp Daly. I have never enountered a larger band than some three or four hundred which I saw on the Seroy Lakes, near North Hudson Bay in the autumn of 1878. During the subsequent autumn on King William Land, I saw no less than a thousand in a single day.
When first thrown wholly upon a diet of reindeer meat, it seems inadequate to properly nourish the system and there is an apparent weakness and inability to perform severe exertive, fatiguing journeys. But this soon passes away in the course of two or three weeks. At first the white man takes to the new diet in too homeopathic a manner, especially if it be raw. However, seal meat which is far more disagreeable with its fishy odor, and bear meat with its strong flavor, seems to have no such a temporary debilitating effect upon the economy. The reindeer are scattered during the spring and summer which is the breeding season, but as the cold weather approaches they herd together in vast bodies.
Toolooah, my most excellent Innuit hunter, never failed to secure one during every hunt. I knew him to kill seven out of a band of eight reindeer with the eight shots in the magazine of his Winchester before they could get out of range. On ten different occasions he killed two deer at one shot and once three fell at a single discharge. The number of times he dispatched one and wounded others, or wounded two or even three at a single shot, which he afterwards secured, seemed countless.
That he supported an average of nine souls (not counting double that number of dogs dependent upon him for about ten months), coupled with a score of 232 reindeer during that period, besides a number of seal, musk-ox and polar bear, demonstrates his great abilityas a hunter in these inhospitable climes.
On our journey a thorough search was made of that portion of the coast that Frank and Henry had not previously looked over, but nothing rewarded either our or their labors except an oar found
near the head of Washington Bay. Our trip was also our first continued experience with a raw meat diet and, whenever the weather was sufficiently cold to freeze it into a hard mass, we
found it not altogether unacceptable. Raw versus cooked meat brings up the interesting subject of the different methods of eating by the Innuits, and we no longer considered ourselves aliens in this
foreign land.
February 14, 1879
Frederick Schwatka
Carnivore
Last Visit with Whalemen - Preparation for Departure
Lieutenant Schwatka "I found a great deal of scurvy prevailing among the ships and the large number of crews. The greater variety of animal life in the frigid zones over the vegetable (the latter having hardly an edible representative in the whole arctic flora) makes it the main dependence on which the polar voyager must rely to secure exemption from that disease."
Leaving Camp Daly on the 10th of February I arrived at Marble Island on the 14th. I shall not dwell long on the various commonplace incidents encountered, the kindnesses of the officers of the whaling ships, the wonderful but pleasant change to a civilized abode once more. However, it was a suffocating feeling which first accompanied that change, as I had left the temperature of the igloo for that of the ships, generally kept at about 77 * F. I found a great deal of scurvy, that bane of the Arctic sailor, prevailing among the ships and the large number of crews.
The greater variety of animal life in the frigid zones over the vegetable (the latter having hardly an edible representative in the whole arctic flora) makes it the main dependence on which the polar voyager must rely to secure exemption from that disease. Every exertion should be made to make the procurement of game as certain as possible by being well provided with the very best of arms, ammunition, and hunting implements and above all good native hunters.
Sir John Ross thought scurvy was produced by the want of fresh bread, yet my party was without fresh bread for two years, and nearly a year without bread of any kind, certainly a fair enough test to exclude it from any of the essential causes. Still the use of fresh bread as an auxiliary prophylactic can not be too strongly dwelt upon. Sir Edward Perry believed that scurvy's principal cause was in the clammy moisture of the ships' quarters, especially when the crew were compelled to sleep in damp bedding. Yet I found no dampness whatever in most of the whaleships suffering with the disease. Innumerable cases where large parties of men have been long subjected to this inconvenience without incurring it makes it a mooted question whether such value can be attributed to it as was by such eminent authority as Sir Edward.
In the employment of a fresh animal food in the Polar zones a great obstacle is the antipathy with which such a diet of fish- eating animals is received. The flesh of the reindeer and musk-ox is at once acceptable, but the walrus, seal and polar bear, have peculiar flavors which with some people it is almost impossible to overcome. The most tenacious epicures are to be found in the forecastle. The educated officer, whose mess table in the past may have been a animated market report, can, with an honorable incentive ahead of him, more readily relinquish his bill of fare than can the foremast hand with his hard tack, salt junk and bitter coffee, to which he is so firmly wedded.
January 1, 1339
Cronica universalis, written by the Milanese friar Galvaneus de la Flamma
A Milanese friar named Galveneus de la Flamma writes about the Arctic people who survive off of a carnivore diet, and who live in fear of the 'huge white bears.' "In this land, there is neither wheat nor wine nor fruit; people live on milk, meat, and fish."
Further northwards there is the Ocean, a sea with many islands where a great quantity of peregrine falcons and gyrfalcons live. These islands are located so far north that the Polar Star remains behind you, toward the south. Sailors who frequent the seas of Denmark and Norway say that northwards, beyond Norway, there is Iceland; further ahead there is an island named Grolandia, where the Polar Star remains behind you, toward the south. The governor of this island is a bishop. In this land, there is neither wheat nor wine nor fruit; people live on milk, meat, and fish. They dwell in subterranean houses and do not venture to speak loudly or to make any noise, for fear that wild animals hear and devour them. There live huge white bears, which swim in the sea and bring shipwrecked sailors to the shore. There live white falcons capable of great flights, which are sent to the emperor of Katai. Further westwards there is another land, named Marckalada, where giants live; in this land, there are buildings with such huge slabs of stone that nobody could build with them, except huge giants. There are also green trees, animals and a great quantity of birds. However, no sailor was ever able to know anything for sure about this land or about its features.
January 1, 1945
Preliminary Survey of Dietary Intakes and Blood Levels
of Cholesterol and the Occurrence of Cardiovascular
Disease in the Eskimo
Showing the Results of Analyses of Eskimo Foods - Ringed Seal, Bearded Seal, Walrus, Polar Bear, Mountain Sheep, Reindeer, Caribou, in terms of Blubber, Liver, Skin, Meat, Oil, Boiled Head and more.
The results of analyses of Eskimo foods are presented in Table 1. On the basis of nutritional surveys with individual food weighings in different families from four Eskimo settlements in Alaska and the above-mentioned results of cholesterol determinations in Eskimo foods, supplemented by figures available for the cholesterol content of nonEskimo foods (Okey, 1945; Pihl, 1952), the cholesterol intake of Eskimos has been estimated (Tables 2, 3). From these calculations it is observed that the mean caloric consumption of the 45 adult male and female Eskimos was about 2,700 calories, the fat consumption was 105 g and the mean cholesterol intake was roughly 340 mg daily, varying from 150 mg to 700 mg per day. It should be noted that these cholesterol figures may be considered as minimum values because several of the food items ingested could not be included in the calculation since the cholesterol content was unknown. It may also be noted that the cholesterol intake varies greatly from one Eskimo group to another, depending on the different dietary habits. Thus, it was observed that among the inland Eskimos, the Nunamiuts at Anaktuvuk Pass, some of the men consumed as much as 70 grams or more of boiled brain from mountain sheep in a single evening meal yielding almost 600 mg cholesterol from this food item alone.
It is thus evident that some Eskimos have fairly high cholesterol intakes compared with healthy American white men, although the mean intake for the 45 Eskimos studied is in the order of 2.5 g per week (varying from 1 to 5 g) . This corresponds to the group of moderate habitual cholesterol intakes reported for normal American men (Keys, 1949) while in the Inland Eskimos the mean figure is in the order of 4 g cholesterol per week, which corresponds to the group of highest habitual cholesterol intakes for normal American men, reported by Keys (1949).
Keys (1950) has estimated that the American diet varies with regard to cholesterol content from a low of 200-300 mg daily to 700-800 mg, depending on the food consumed. Gubner and Ungerleider ( 1949) have given the figure 200--360 mg for daily cholesterol intake on a mixed diet.
It thus appears that the estimated mean figures for cholesterol intakes in Eskimos may be comparable to those of Whites on a mixed diet.
The average figure for the daily fat consumption in the 45 Eskimo subjects reported here was only about 105 g (377 of the calories), while in a larger survey the average daily fat consumption in Alaskan Eskimos was 139 g (40 % of the calories). In normal white men living in Alaska the fat consumed represented 37.5 %( of the calories ingested.
In the Eskimo subjects the mean serum cholesterol concentration was 203 mg per 100 ml (Table 4) which is about the same as is found in normal Whites. Thus L. J. Milch (personal communications) found an average level of 207 mg cholesterol per 100 ml serum in Whites 30-35 years old.
On the other hand, the Eskimo serum concentration of Sf 12-20 lipoproteins was 20 mgl100 ml as against 28 mgl100 ml in Whites of similar age, observed by Milch (personal communications). For Whites under 25 years of age Milch found 24 mg/lOO ml, and for Whites 40-45 years of age 38 mg/l 00 m!.
January 1, 1911
Vilhjalmur Stefansson
My Life with the Eskimo - Black, Brown, Polar Bears
The habits of black bears, brown bears, and polar bears are described as they relate to Eskimo life.
Ursus americanus Pallas. Black Bear.
The Black Bear is very common along the Athabaska River, and we saw eight Bears in less than four hours of drifting on the river below the Grand Rapids, May 14th , 1908. This part of the Atha baska has the reputation of being the best place for Black Bears in North America. They are seen most abundantly just after the ice goes out in the spring and they come down to the edge of the river to look for dead fish which have been pushed up by the ice . In the fall the tangled brushy slopes along the Athabaska are said to be much frequented by Black Bears which feed largely on blueberries at that season . It is, however, more difficult to see the Bears in autumn on account of the thickness of the underbrush . Black Bears are said by the Indians to be fairly common around Great Bear Lake and occasionally north to the Mackenzie delta .
Ursus richardsoni Swainson . Barren Ground Bear. Ak'lak (Es kimo name for Brown Bear from Bering Sea to Coronation Gulf).
Brown Bears, or Grizzlies, are found sparingly throughout the Arctic mainland from western Alaska to Coronation Gulf. There are undoubtedly two or three races or species in this region , but, owing to lack of specimens from important localities and lack of time for critical examination of the material at hand, I am obliged to nominally refer to the Arctic Brown Bears under the above heading. In northern Alaska they do not appear to be very common on the north side of the Endicott Mountains, and seldom, if ever, come out on the coastal plains. The inland Eskimo occasionally kill specimens and often use the skin for a tent door. I saw the skins of two which were killed on the Hula-hula River, in October, 1908, by a Colville River Eskimo named Auktel'lik. Auktel'lik told me he had killed forty four Aklak in his time, and that only two of the lot came towards him and tried to attack him. From what I could learn he had not hunted very far west of the Colville or at all east of the Mackenzie. Most Eskimo, however, speak with much greater respect of the pugnacity of Aklak than of Nannuk (the Polar Bear) and are much more cautious about attacking him. On July 3d, 1912, Mr. Frederick Lambart, Engineer on the Alaska - Yukon Boundary Survey, shot a Brown Bear on the Arctic slope of the mountains on the 141st meridian, about forty - five miles from the Arctic Ocean at Demarcation Point. From three photos of the dead Bear, it appeared to be of the long -nosed type, with a pronounced hump on the shoulders. Mr. Lambart informs me that this bear has been examined by Dr. C. Hart Merriam and declared to be a new species hitherto undescribed . In the Mackenzie delta tracks of Brown Bears are occasionally seen, but the bears are seldom killed, owing to the impracticability of hunting them through the dense underbrush on the islands in summer.
I have been warned many times by natives against shooting at a Barren Ground Bear unless from above — as a wounded bear has greater difficulty in charging uphill. So far as our experience goes, however, the Barren Ground Bear is an inoffensive and wary brute, preferring to put as much ground as possible between himself and human society. I saw but one unwounded bear come towards me, but as he did not have my scent his advance was perhaps more from mere curiosity than from hostility. As the bear was on the uninhabited coast between Cape Lyon and Dolphin and Union Straits, and he had probably never seen human beings before, this inference seems plausible . Wounded bears are another story, of course, and it is generally admitted that the Barren Ground Bears are tougher or more tenacious of life than the Polar Bears.
We found the center of greatest abundance of the Barren Ground Bears in the country around Langton Bay and on Horton River, not more than thirty or forty miles south from Langton Bay. One was killed at Cape Lyon, and another on Dease River east of Great Bear Lake. In this region our party killed about twenty specimens, most of which were obtained on our dog-packing expeditions in early fall. The Bears here showed two very distinct types, which for convenience we designate as the long -snouted and short- snouted types. The skulls are readily separated on this basis. It is rather hard to distin guish them by color, as late summer skins are usually much bleached out. In general the long-snouted Bears were inclined to a reddish brown cast of color ( sometimes almost bay color) , while the others were often very dark —dusky brown, with tips of hairs on dorsal surface light grayish brown on fulvous, sometimes with tips a faint golden yellowish tint. The Barren Ground Bears go into hibernation about the first week of October and come out early in April while the weather is still very cold .
While ascending the Horton River we saw at intervals the nearly fresh tracks of three Barren Ground Bears on December 29th, 1910, and January 1st, 1911, going along the river and over the shortest portages, at least forty miles in approximately a straight line. Neither the Eskimo or the Slavey Indian who were with us had ever before seen evidences of Brown Bears out of their holes in midwinter. They seem to be nearly as fat on their first emergence from their long sleep as in the fall, but speedily lose weight, and early summer specimens are invariably poor. This is natural from the nature of their food , which is to a large extent vegetable. Although the Bear's native heath is often conspicuously furrowed in many places by the unearthed burrows of Arctic spermophiles (Citellus parryi or C. p. kennicotti) I believe that the Bear's search is more for the little mammal's store of roots than for the little animal itself. The Bear's stomach is much more apt to contain masu roots (Polygonum sp. ) than flesh . A bear must needs be very active to catch enough spermophiles above ground in spring and early summer, and if carcasses are not to be found, the Bears evidently suffer most from hunger at this season, when they can neither dig roots for themselves in the frozen ground nor dig out the spermophiles and their caches. One specimen was killed by an Eskimo of our party on Dease River, east of Great Bear Lake, after the Bear had gorged himself on a cache of Caribou meat, having more than fifty pounds of fresh meat in his stomach. A few Bears were met with in the Coppermine country, but throughout the Coronation Gulf region they are apparently rare. The Eskimo say that the Aklak is not found on Victoria Island. The fact that the Barren Ground Bears seem to always have at least two cubs at a birth, that old bears are often seen followed by two young cubs and one yearling cub, and that we never saw more than one yearling cub accompanying its mother, is evidence that there must be considerable mortality among the cubs in the first year, probably during the second spring. The new -born cubs, of course , are nursing in the spring, while the older cubs presumably have to depend upon their own foraging. Otherwise these Bears have practically no enemies besides man. As there is little market for their skins, neither Eskimo nor Indians make any special effort to hunt them, the specimens obtained being in general upon summer Caribou hunts.
Thalarctos maritimus ( Phipps) . Polar Bear. Nan'nuk (all Eskimo dialects) .
The Polar Bear or White Bear is a circumpolar cosmopolitan, although seldom found very far from the sea ice. In winter these bears are apt to appear anywhere along the coast, but in summer their occurrence depends largely upon the proximity of pack ice. Along the Arctic coast of Alaska, east of Point Barrow , the species is not very abundant, and the same may be said of the coast east and west of the Mackenzie delta. Numbers are annually killed near Cape Bathurst. The Polar Bears seem to be most abundant around Cape Parry and the southern end of Banks Island, very rarely passing through Dolphin and Union Straits, into Coronation Gulf. Around Cape Parry, in August, 1911 , we saw fourteen Bears within two days roaming about the small rocky islands, evidently marooned when the ice left the beach. They are often seen swimming far out at While whaling about twenty miles off Cape Bathurst ( the nearest land) and about five miles from the nearest ice mass, we saw a Polar Bear which paddled along quite unconcernedly until he winded the ship, then veered away, heading out toward the ice pack . Shortly before Christmas an officer from the schooner Rosie H., with a party of Eskimo, killed a female and two newly born cubs in a hole in the snow near the mouth of Shaviovik River, west of Flaxman Island. It was said to be unusual for a Polar Bear to have cubs so early in the winter.










