Bigger than the notorious great white, they grow to 23-feet long and are so fearsome they have even been known to eat polar bears. The sharks usually eat large seals but have even been known to polish off polar bears and reindeer.
No Polar Bears do not eat penguins because polar bears live in the arctic region (north pole) while penguins live in Antartica and in the southern hemisphere. As both polar bears and penguins live poles apart so there is no chance for the polar bears to eat penguins.
Polar bears feed mainly on ringed and bearded seals. Depending upon their location, they also eat harp and hooded seals and scavenge on carcasses of beluga whales, walruses, narwhals, and bowhead whales. On occasion, polar bears kill beluga whales and young walruses.
Polar bears at their largest weigh about half a ton, so catching a blue whale, even a newborn calf, is highly improbable. But if a whale were to wash ashore or get caught on the ice/rocks, the bear would probably have a feast.
They eat a variety of fish and invertebrate prey. Killer whales and polar bears have been known to attack and eat beluga whales. Scientists believe that belugas may swim far into ice-covered waters to avoid orcas but that this may put them in greater risk of predation by polar bears.
The beluga defends itself from whalers, killer whales, sharks and other predators through indirect means only. It is not at all aggressive and will do its best to get away if it finds itself attacked, regardless of circumstance. There are three methods by which they avoid predation. The first is camouflage.
PREY: The orca is at the top of the marine food web. Their diet items include fish, squid, seals, sea lions, walruses, birds, sea turtles, otters, other whales and dolphins, polar bears and reptiles. They even have been seen killing and eating swimming moose. Humans are the only significant predators of orcas.
Predators. Killer whales and polar bears prey on beluga whale adults and calves.
A big male tiger could kill a small polar bear, but a big bear would crush the tiger's skull with one swipe. Man a polar bear can totally destroy a Siberian tiger more often than not. That's more than twice the weight of a Siberian tiger.
In the case of a small shark caught in a tidal pool, the black bear could easily kill the shark based on the bear's greater size and the shark's being trapped. A large shark that was grounded on the beach would already be dying. A black bear would be able to finish off the shark and eat a little bit.
A fight between the two would likely go similar to a polar bear against an undersized one of its species as it overpower the gorilla and sink its teeth into its neck and more than likely break it. Or the polar bear would just hit the gorilla with its claws.
Adult polar bears have no natural predators, though walruses and wolves can kill them.
In fact, an aggressive walrus can be dangerous for a polar bear in the water. There have been isolated observations of walruses attacking polar bears in the water, though it is unusual. In the water, too, walruses generally react to polar bears as to predators – they fear and avoid them.
Greenland sharks are not considered dangerous to humans, in part because they live in regions where people do not typically swim; the only known report of a possible attack by a Greenland shark on a person dates to 1859.
Polar bears eek out a 4 to 2 win against sharks.
Most sharks favor much warmer conditions. Killer whales, however, have been spotted further north in recent years. Both could handle most potential predators, but not killer whales,” Kovacs said. Gallant said warming was unlikely to help the Greenland shark catch bears.
Yes killer whale are known to hunt and consume shark meat when they are having difficulty finding other less defensible prey. In fact killer whales have also been known to hunt variety of marine mammals including some of the biggest known whales. Depending on where the killer whale lives its diet can vary widely.
Like polar bears killer whales (orcas) are also apex predators. They are called the wolves of the sea primarily because orcas hunt in packs. However killer whales do not eat polar bears. Sea turtles, fish, cephalopods, and sea birds form the essential components of killer whale's diet.
The eastern North Pacific resident killer whales prefer Chinook salmon. Transient whales spend about 90% of daylight hours foraging. They primarily eat marine mammals including seals, sea lions, walruses, baleen whales, other toothed whales, and occasionally sea otters.
But polar bears don't hibernate in the strict sense of the word. True hibernators experience a marked drop in heart rate and body temperature and generally stay for a long period in a den. Adult males and non-pregnant females don't den up at all.
Killer whales are apex predators, meaning that they themselves have no natural predators. They are sometimes called the wolves of the sea, because they hunt in groups like wolf packs. Killer whales hunt varied prey including fish, cephalopods, mammals, sea birds, and sea turtles.
Diet. Orcas are apex predators, at the top of the food chain. Killer whales feed on sea birds, squid, octopuses, sea turtles, sharks, rays and fish. They also eat most marine mammals, such as seals and dugongs.
Because of their size, power and speed, adult blue whales have virtually no natural ocean predators. The only sea creature known to attack blue whales is the orca whale (scientific name: Orcinus orca) also known as the “killer whale”. They have been known to work in groups to attack blue whales.
Climate change and polar bears. Temperatures in the Arctic are rising at least twice as fast as the global average and sea ice cover is diminishing by nearly four per cent per decade. The loss of sea ice affects polar bears' ability to find food, studies show.
Except for one subspecies of grizzly bear, the polar bear is the largest and most powerful carnivore on land. It has no natural predators and knows no fear of humans, making it an extremely dangerous animal. strong swimmers, most notably the polar bear.
Seals are a particularly energy-rich food source, especially for hungry mothers and their growing cubs. Polar bears can devour huge amounts of fat from seals when this prey is abundant.
Arctic cod and other fish species eat the krill, which are in turn consumed by ringed seals, the most abundant seal in the Arctic and the primary prey of polar bears. Bears are opportunistic feeders, and will occasionally hunt more difficult prey such as beluga whales, narwhals and walrus.
Polar bears are vulnerable. This is not because they are hunted, but because of the threat of climate change caused by our activities across the world. The primary threat to polar bears is that the sea ice where they hunt is projected to shrink rapidly over the next few decades.
More polar bear cubs die as Arctic ice melts. “Climate change is pulling the sea ice out from under polar bears' feet, forcing some to swim longer distances to find food and habitat,” said Geoff York of World Wildlife Fund, a co-author of the study.
Predators. Adult polar bears have no natural predators except other polar bears. Cubs less than one year old sometimes are prey to wolves and other carnivores. Newborn cubs may be cannibalized by malnourished mothers or adult male polar bears.
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. This specimen, when mounted, stood 3.39 m (11 ft 1 in) tall on its hindlegs.
Polar bears that are forced to live on land due to melting ice face lean times in most of the Arctic. Food found on land, such as berries and eggs, lack the high fat content and calories of the polar bear's preferred prey. Also, catching a seal in open water is far more difficult than catching on the ice.
Life Cycle
Polar bears mate every other year in mid-summer. The female digs a den in the snow and stays there for nine months until her young are born. She has between one and four cubs. The cubs are hairless and toothless when they are born and are about the size of a chipmunk!
