Photo a Polar bear Undoubted stalker Walrus In the frozen Arctic: Predators slowly approach an inch, camouflaged by ice and snow, enough distance to bounce off. Then, by hitting the walrus on the head with a large rock, it gives a fatal blow.
It may sound like what you see in comics, not in nature.But for centuries, the Inuit people have been Arctic Share such stories with non-native explorers and naturalists, explaining that polar bears kill or brilliantly prey with stones and ice blocks that grab their feet (or throw cliffs at animals below). doing. Sculpture).
In a new study, an Inuit anecdote explaining this behavior was examined “from various locations over a long period of time,” and it was very widespread and consistent, with the possibility of polar bears wielding weapons and other objects in rare cases. Was suggested. .. However, it is difficult to say for sure until a scientific researcher actually catches a walrus with a club and a polar bear.
“I was always impressed with the accuracy and reliability of the animal observations reported by the experienced Inuit Hunters, so despite the behavior itself, the explanation is not just a myth, but a report of the actual observations. Ian Sterling, a member of the Scientific Advisory Board of Polar Bears International, the lead author of the study, and an associate professor of the University of Alberta’s Faculty of Biological Sciences, emailed Live Science. Said in.
Polar bear Inuit description (Ursus maritimusAccording to research, lifting, and sometimes throwing, large blocks of rock and ice dates back to the late 1700s. According to the explanation written by the naturalist Otto Fabrikius in the book “Fauna Groenlandica” in 1780, polar bears grab a considerable chunk of ice and launch it onto the walrus’s head.
“Bear makes it [the walrus] It loses balance (or “stagger” is more literal) and therefore kills it easily, “scientists wrote in the June issue of the journal. Arctic..
Another Inuit report in 1883 states that another ice-biting bear “grabbed a large amount of ice on his paw, grew up on his hind legs, and threw it at the head of a half-grown walrus with great force.” Another Inuit report, 1925, stated that polar bears “selected young walruses carefully and threw blocks of ice onto them with enough force to keep them stuck.”
In one of the astonishing examples of 19th-century Arctic explorer Charles Francis Hall, polar bears allegedly threw rocks from high cliffs onto walrus heads. Hall published a sculpture of the scene in 1865, based on an Inuit guide on Baffin Island.
“The bear climbs a cliff, throws a large rock at the animal’s head, calculates distances and curves with incredible accuracy, and thereby crushes thick bulletproof skulls,” Hall wrote in the book.Arctic Studies and Eskimo Life“(Harper & Brothers, 1865).
According to the study, “if the walrus isn’t killed immediately, or if it’s just stunned, the bear rushes down to the walrus, grabs the rock, and hits his head until the skull breaks,” Hall concludes.
Scientists also reviewed recent reports by Inuit and non-Inuit witnesses suggesting that bears used rocks and ice to nullify hunting and human hunter traps. However, scientists write that these conclusions were based on the arrangement of rocks and ice left by the bear and did not reflect the observation of the bear actually using the object as a tool.
However, a 2010 photo shows a captured male polar bear named GoGo at the Tennoji Zoo in Osaka reaching for food using the “tools” in the enclosure. Studies show that caregivers hung pieces of meat about 10 feet (3 meters) above GoGo’s pool by challenging GoGo by solving this puzzle.
At first, GoGo tried to jump to the flesh. But after a month of failure, he “invented” two tools. One is a plastic pipe chucked into food and the other is an approximately 7 foot (2 m) branch used to tap the meat and unhook it. .. Initially, GoGo took hours to succeed, but researchers reported that it was soon able to knock down meat in just five minutes.
Studies suggest that the GoGo example, along with centuries-old anecdotes and other recent observations, certainly allows the use of tools for hunting among wild polar bears. ..
“Occasionally adult polar bears may be able to mentally conceptualize similar uses of ice and stone as tools,” the study authors reported. However, such extreme measures can only be used on walruses, the largest prey for polar bears to hunt.
Polar bears prey on walruses and seals, which are far more formidable targets. Adult ringed seal (Psahi Spida) Weighs up to 165 pounds (75 kg), 2-year-old walrus (Odobenus rosmarusIt weighs a whopping 750 pounds (340 kg) and a grown adult weighs as much as 2,000 pounds (907 kg). According to the Alaskan Fish and Games Division..In addition, walruses have long tusks to protect themselves during close encounters, and their skulls are denser and less fragile than seal skulls, said Erica Hill, a professor of anthropology at the University of Alaska Southeast, in 2017. Reported in the journal Études / Inuit / Research.. (Hill was not involved in a recent study.)
Therefore, the researchers concluded that the target that adult polar bears occasionally throw at Boulder is most likely a walrus.
Originally published in Live Science.
Polar bears may use blocks of rock or ice to crush the walrus skull
Source link Polar bears may use blocks of rock or ice to crush the walrus skull