Seals sleep in the water as well as on land. In the water, they sleep floating in a standing position, like a fishing bobber, or floating horizontally on the surface. Because they are sleeping and not actively swimming, they can stay under water much longer than when hunting for food.
On occasion, polar bears kill beluga whales and young walruses. When other food is unavailable, polar bears will eat just about any animal they can get, including reindeer, small rodents, seabirds, waterfowl, fish, eggs, vegetation (including kelp), berries, and human garbage.
Most people can hold their breath for somewhere between 30 seconds and up to 2 minutes.
Polar bears depend on sea ice to hunt. Adult male polar bears will sometimes hunt walruses, but the smaller females, especially when malnourished, lack the strength necessary to take down the much larger predator.
Polar bears live in the Arctic, but not Antarctica. Down south in Antarctica you'll find penguins, seals, whales and all kinds of seabirds, but never polar bears. Even though the north and south polar regions both have lots of snow and ice, polar bears stick to the north.
Among the most amazing of pinnipeds are the elephant seals. They are the biggest of pinnipeds – bigger even than walruses – there being a record of a giant male Southern elephant seal that was between 6.5 and 6.8 m long and weighed over 4000 kg (Carwardine 1995).
Yes, some species of shark, like the great white, will eat a walrus. Sharks are predatory fish that belong to the suborder Selachimorpha.
The tusks grow for about 15 years before they reach their full length, which is about 40 in (102 cm) for males and 30 in (76 cm) for females. Both the male and female walrus grow tusks. Another important use of a walrus's tusks is to pull itself out onto the ice.
And though the walrus is an Arctic species and thus much harder to study in the wild than the elephant seals and sea lions that flop onto the beaches of Northern California, scientists are gathering evidence that Odobenus is the most cognitively and socially sophisticated of all pinnipeds.
Walruses might be large animals, but they are very friendly and smart. Most of them are curious and won't attack you unless they feel threatened. While you still need to be cautious when around one, they generally leave humans alone.
Their tusks, which are found on both males and females, can extend to about three feet, and are, in fact, large canine teeth, which grow throughout their lives. Male walruses, or bulls, also employ their tusks aggressively to maintain territory and, during mating season, to protect their harems of females, or cows.
Walruses live in one of the harshest environments on Earth. Not only do they dwell where temperatures are frigid -- they also spend the majority of their time in the water, where they lose body heat 27 times faster than they do on land.
Life historyWalruses live to about 20–30 years old in the wild. The males reach sexual maturity as early as seven years, but do not typically mate until fully developed at around 15 years of age.
They mainly eat ringed seals, but may also eat bearded seals. Polar bears hunt seals by waiting for them to come to the surface of sea ice to breathe. When the seal nears the surface, the polar bear will bite or grab the seal and pull it onto land to feed. They also eat walruses and whale carcasses.
Fur seals often catch and eat penguins on the island. The incidents are the only time pinnipeds, the group that includes seals, fur seals and sea-lions, have been known to have sex with an animal from a different biological class, in this case a mammal trying to have sex with a bird.
Walrus are the largest pinniped. Seals, sea lions, and walruses belong to a group of marine mammals called pinnipeds, referring to their flippered feet. Seals (true seals or earless seals) have no external ear flaps.
The main threats for penguins in water are leopard seals, fur seals, sea lions, sharks and killer whales. On land, foxes, snakes, lizards, dogs and some other animals are a threat for eggs and chicks in the case of species not in the Antarctic regions, like the Galapagos penguin among others.
Because of their size and tusks, walruses only have two natural predators: orcas (killer whales) and polar bears. However, both predators prefer to attack easier prey like seals.
The tusks of a walrus are the upper canine teeth, which grow very long, sometimes to a metre in length. Walruses use their tusks to scrape up the shellfish and clams they eat, and for gripping the ice, or fighting enemies. Their tusks are also the sign of a walrus's age and importance.
Caniformia is a suborder within the order Carnivora consisting of "dog-like" carnivorans. They include dogs, bears, wolves, foxes, raccoons, badgers and mustelids. The Pinnipedia (seals, walruses and sea lions) are also assigned to this group.
They don't move quickly on land but are swift in the water. Walruses can swim on average around 4.35
mph (7
km/h) and as fast as 21.74
mph (35
km/h), according to the MarineBio Conservation Society.
Walrus.
| Walrus Temporal range: Pleistocene to Recent |
|---|
| Genus: | Odobenus Brisson, 1762 |
| Species: | O. rosmarus |
| Binomial name |
Walruses produce sounds both above and below water. Walruses are among the most vocal of the pinnipeds. They produce growls, taps, knocks, grunts, barks, soft whistles, rasps, and clicks. These sounds are not produced by the vocal cords but originate from air sacs, which extend from the pharynx.
Primary dentine has a classical ivory appearance. Secondary dentine looks marble or oatmeal-like. This type of secondary dentine is diagnostic for walrus tusk ivory. The dentine in walrus teeth is mainly primary dentine.
