[4] They rut from January through April, decreasing their food intake dramatically. Though their main food is sea molluscs such as mussels and cockles, they sometimes eat other seals. The males possess a large baculum (penis bone), up to 63 cm (25 in) in length, the largest of any land mammal, both in absolute size and relative to body size. In the poem, the eponymous antiheroes use trickery to consume a great number of oysters. [1] The Pacific walrus is not listed as "depleted" according to the Marine Mammal Protection Act nor as "threatened" or "endangered" under the Endangered Species Act. Does Jerry Seinfeld have Parkinson's disease? It is the sole surviving member of the family Odobenidae, one of three lineages in the suborder Pinnipedia along with true seals (Phocidae) and eared seals (Otariidae). O. rosmarus rosmarus [85], Currently, two of the three walrus subspecies are listed as "least-concern" by the IUCN, while the third is "data deficient". Be the first to answer! [27] The males reach sexual maturity as early as seven years, but do not typically mate until fully developed at around 15 years of age. [69] The bears also isolate walruses when they overwinter and are unable to escape a charging bear due to inaccessible diving holes in the ice. [68] The walrus does not, however, comprise a significant component of either of these predators' diets. In other words, walruses would be the last foods polar bears would to like to eat. All Rights Reserved. An occasional male of the Pacific subspecies far exceeds normal dimensions. [51][52] In April 2006, the Canadian Species at Risk Act listed the population of the northwestern Atlantic walrus in Quebec, New Brunswick, Nova Scotia, Newfoundland and Labrador as having been eradicated in Canada. The blubber layer beneath is up to 15 cm (6 in) thick. The walrus has a diverse diet, feeding on numerous small marine The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. While some of these uses have faded with access to alternative technologies, walrus meat remains an important part of local diets,[77] and tusk carving and engraving remain a vital art form. [81], The effects of global climate change are another element of concern. [6] For example, the Old Norse word hrossvalr means "horse-whale" and is thought to have been passed in an inverted form to both Dutch and the dialects of northern Germany as walros and Walross. The diet of the Pacific walrus consist almost exclusively of benthic invertebrates (97 percent). Tolkien[5] to derive from a Germanic language, and it has been attributed largely to either the Dutch language or Old Norse. The species name rosmarus is Scandinavian. While walruses eat all sorts of small aquatic creatures, their food of choice is clam. [72] However, killer whales have been observed successfully attacking walruses with few or no injuries.[73]. This strategy of delayed implantation, common among pinnipeds, presumably evolved to optimize both the mating season and the birthing season, determined by ecological conditions that promote newborn survival. [4], Walruses live to about 20–30 years old in the wild. [60] The walrus sucks the meat out by sealing its powerful lips to the organism and withdrawing its piston-like tongue rapidly into its mouth, creating a vacuum. Yes walrus' eat penguin eggs and penguins. [47][48], The much smaller population of Atlantic walruses ranges from the Canadian Arctic, across Greenland, Svalbard, and the western part of Arctic Russia. This and its lack of orbital roof allow it to protrude its eyes and see in both a frontal and dorsal direction. O. rosmarus laptevi (debated). [4] The females are diestrous, coming into heat in late summer and also around February, yet the males are fertile only around February; the potential fertility of this second period is unknown. [87][88], Walrus ivory masks made by Yupik in Alaska, John Tenniel's illustration for Lewis Carroll's poem "The Walrus and the Carpenter", Dutch explorers fight a walrus on the coast of Novaya Zemlya, 1596. [23] Tusks are slightly longer and thicker among males, which use them for fighting, dominance and display; the strongest males with the largest tusks typically dominate social groups. penguins because they are bigger for an apatite. The archaic English word for walrus—morse—is widely thought to have come from the Slavic languages,[9] which in turn borrowed it from Finno-Ugric languages. [50] This population was nearly eradicated by commercial harvest; their current numbers, though difficult to estimate, probably remain below 20,000. When did organ music become associated with baseball? [49] The Atlantic walrus once ranged south to Sable Island, Nova Scotia, and as late as the 18th century was found in large numbers in the Greater Gulf of St. Lawrence region, sometimes in colonies of up to 7,000 to 8,000 individuals. 3 4 5. What do walruses eat? [29] Calves are born during the spring migration, from April to June. The mothers nurse for over a year before weaning, but the young can spend up to five years with the mothers. [66][67], Due to its great size and tusks, the walrus has only two natural predators: the killer whale (orca) and the polar bear. ... Walruses. The Russian Atlantic and Laptev Sea populations are classified as Category 2 (decreasing) and Category 3 (rare) in the Russian Red Book. Young walruses are deep brown and grow paler and more cinnamon-colored as they age. Walruses live mostly in shallow waters above the continental shelves, spending significant amounts of their lives on the sea ice looking for benthic bivalve mollusks to eat. Wiki User. The females begin ovulating as soon as four to six years old. [80] The sustainability of these levels of harvest is difficult to determine given uncertain population estimates and parameters such as fecundity and mortality. organisms like shrimp, crabs, tube worms, soft corals, tunicates, Limits on commercial hunting allowed the population to increase to a peak in the 1970s-1980s, but subsequently, walrus numbers have again declined. There can be 400 to 700 vibrissae in 13 to 15 rows reaching 30 cm (12 in) in length, though in the wild they are often worn to much shorter lengths due to constant use in foraging. [26] The vibrissae are attached to muscles and are supplied with blood and nerves, making them highly sensitive organs capable of differentiating shapes 3 mm (1⁄8 in) thick and 2 mm (3⁄32 in) wide. [citation needed][56][57], Walruses prefer shallow shelf regions and forage primarily on the sea floor, often from sea ice platforms. As a secondary sexual characteristic, males also acquire significant nodules, called "bosses", particularly around the neck and shoulders. Their main food is clams which they break open with their teeth and then suck in the interior. Normally, they feed at a depth of around 33 to 164 feet. [89], The "walrus" in the cryptic Beatles song "I Am the Walrus" is a reference to the Lewis Carroll poem. Their favorite prey are the "Benthic Answer. These are elongated canines, which are present in both male and female walruses and can reach a length of 1 m (3 ft 3 in) and weigh up to 5.4 kg (12 lb). Walruses are relatively long-lived, social animals, and they are considered to be a "keystone species" in the Arctic marine regions. Since a walrus's hide usually accounts for about 20% of its body weight, the total body mass of these two giants is estimated to have been at least 2,300 kg (5,000 lb). ][citation needed] Compare морж (morž) in Russian, mursu in Finnish, morša in Northern Saami, and morse in French. 2012-02-25 07:48:25 2012-02-25 07:48:25. [24], Gestation lasts 15 to 16 months. The walrus relies on this ice while giving birth and aggregating in the reproductive period. [62] There have been isolated observations of walruses preying on seals up to the size of a 200 kg (440 lb) bearded seal. "Ecology and Biology of the Pacific Walrus, "The sensitivity of the vibrissae of a Pacific Walrus (, "Carnivorous walrus and some arctic zoonoses", "Izembek National Wildlife Report Sept 2015", "Stock Assessment Report: Pacific Walrus – Alaska Stock", "Status of Marine Mammals of the North Atlantic: The Atlantic Walrus", "Atlantic Walrus: Northwest Atlantic Population", "Disappearance of Icelandic Walruses Coincided with Norse Settlement", 10.1890/0012-9615(2001)071[0137:CDPOPA]2.0.CO;2, "Feeding behaviour of free-ranging walruses with notes on apparent dextrality of flipper use", "Feeding and Trophic Relationships of Phocid Seals and walruses in the Eastern Bering Sea", "Narwhals, Narwhal Pictures, Narwhal Facts", "Interactions between Polar Bears and Overwintering Walruses in the Central Canadian High Arctic", "North American Bear Center – Polar Bear Facts", "A review of Killer Whale interactions with other marine mammals: Predation to co-existence", "Hunting and Use of Walrus by Alaska Natives", "Use and preference for Traditional Foods among Belcher Island Inuit". [10], The coincidental similarity between morse and the Latin word morsus ("a bite") supposedly contributed to the walrus's reputation as a "terrible monster". Be the first to answer this question. Why don't libraries smell like bookstores? Females weigh about two-thirds as much as males, with the Atlantic females averaging 560 kg (1,230 lb), sometimes weighing as little as 400 kg (880 lb), and the Pacific female averaging 800 kg (1,800 lb).

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