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The walrus is a large pinniped marine mammal with discontinuous distribution about the North Pole in the Arctic Ocean and subarctic seas of the Northern He
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- The first three to four months are spent with the blastula in suspended development before it implants itself in the uterus.
- Gestation lasts 15 to 16 months.
- The females join them and copulate in the water.
- Males aggregate in the water around ice-bound groups of estrous females and engage in competitive vocal displays.
- Breeding occurs from January to March, peaking in February.
- the potential fertility of this second period is unknown.
- The females are diestrous, coming into heat in late summer and around February, yet the males are fertile only around February;
- The females begin ovulating as soon as four to six years old.
- They rut from January through April, decreasing their food intake dramatically.
- The males reach sexual maturity as early as seven years, but do not typically mate until fully developed at around 15 years of age.
- Walruses live to about 20–30 years old in the wild.
- 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.
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- The walrus has an air sac under its throat which acts like a flotation bubble and allows it to bob vertically in the water and sleep.
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- As a secondary sexual characteristic, males also acquire significant nodules, called "bosses", particularly around the neck and shoulders.
- Because skin blood vessels constrict in cold water, the walrus can appear almost white when swimming.
- Old males, in particular, become nearly pink.
- Young walruses are deep brown and grow paler and more cinnamon-colored as they age.
- The blubber layer beneath is up to 15 cm (6 in) thick.
- Its skin is highly wrinkled and thick, up to 10 cm (4 in) around the neck and shoulders of males.
- Aside from the vibrissae, the walrus is sparsely covered with fur and appears bald.
- 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.
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- though in the wild they are often worn to much shorter lengths due to constant use in foraging.
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- There can be 400 to 700 vibrissae in 13 to 15 rows reaching 30 cm (12 in) in length,
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- Surrounding the tusks is a broad mat of stiff bristles ("mystacial vibrissae"), giving the walrus a characteristic whiskered appearance.
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- but over half of the teeth are rudimentary and occur with less than 50% frequency, such that a typical dentition includes only 18 teeth (1.1.3.0)/(0.1.3.0).
- The maximal number of teeth is 38 with dentition formula: (3.1.4.2)/(3.1.3.2),
- While the dentition of walruses is highly variable, they generally have relatively few teeth other than the tusks.
- but analyses of abrasion patterns on the tusks indicate they are dragged through the sediment while the upper edge of the snout is used for digging.
- Tusks were once thought to be used to dig out prey from the seabed,
- Tusks are also used to form and maintain holes in the ice and aid the walrus in climbing out of water onto ice.
- The strongest males with the largest tusks typically dominate social groups.
- Tusks are slightly longer and thicker among males, which use them for fighting, dominance and display;
- 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).
- the most prominent feature of the living species is its long tusks.
- While this was not true of all extinct walruses,
- However, vision in this species appears to be more suited for short-range.
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- This and its lack of orbital roof allow it to protrude its eyes and see in both a frontal and dorsal direction.
- The extraocular muscles of the walrus are well-developed.
- Also like phocids, it lacks external ears.
- however, its swimming technique is more like that of true seals, relying less on flippers and more on sinuous whole body movements.
- As with otariids, it can turn its rear flippers forward and move on all fours;