Bí Mật Của Loài Sói Khám Phá Thế Giới Động Vật

The wolf a symbol of beauty and strength embodies both noble and cruel aspects Sói is also one of the deities in Norse mythology who nurtured the two sons of the god of war Eras—Romulus and Remus—founders of Rome For 10 000 years the first animal domesticated by humans was the wolf To this day the wolf remains both a companion and a foe to humanity Yet after all this time there is still much we do not know about this mysterious creature 1 Black Wolf The most common coat colors of wolves are white and gray However among them a few have an exceptionally rare black coat In truth this is not their natural color A 2008 study by Stanford University revealed that a specific gene responsible for black fur appears exclusively in dogs Thus the black wolf appears to be the result of hybridization The gene responsible for this black coat color is dominant Thus it is mostly passed down to the subsequent generations Although the black wolf is not an exceptional hunter it tends to have better immunity The black wolf is almost exclusively found in the cold regions of North America 2 The rate of wolf hybrids appears to be quite rare compared to purebred wolves today In this case the proportion of hybrid wolves has significantly increased due to favorable environmental conditions For many years a growing population has been shifting eastward shrinking the wolf's natural habitat As a result numerous wolf hybrids were produced making up a significant proportion Hybrid wolves are typically smaller than purebred wolves and extremely intelligent They can adapt to urban or residential areas Part of the reason for the significant decline in purebred wolf populations is hunting in their natural habitats 3 Cannibalism Cannibalism is quite common in the world of wolves They live in an extremely harsh environment typically cold regions with scarce food sources Moreover they must compete with many other predatory species Consequently they are forced to prey on injured or sick wolves within a pack When two wolf packs clash over territory a brutal confrontation typically ensues with the defeated pack often becoming prey for the victors There is a grim truth that sometimes they are forced to eat nine of their own offspring 4 Weight We often see images of wolves with a rather agile and flexible appearance Yet some wolf species can weigh nearly 100 kilograms Tropical wolves typically have a smaller build comparable to medium-sized dogs However as one moves further north into Alaska Canada and Russia their size increases The largest grizzly bear ever recorded in North America caught in Alaska in 1939 weighed nearly 90 kilograms Typically they are the alpha wolves always receiving ample food from the rest of the pack 5 Rabies and the onset of madness Unlike many other animals those infected with rabies typically exhibit labored breathing loss of coordination and a tendency to lie still before showing symptoms A wolf infected with the disease is extremely dangerous They appear to instantly go into a frenzy and can attack any nearby creature even those larger than themselves Most wolf attacks on humans occur because the wolves are suffering from disease Although the situation has now decreased and there are treatments available for cases of animals infected with rabies that bite people However wolves typically target and bite their victims' necks and heads As a result most cases are extremely dangerous In normal circumstances wolves typically tend to avoid larger animals 6 American wolves are quite docile In reality wolves in North America are relatively mild-mannered and attack humans less frequently than in other regions There are very few documented cases of wolf attacks on humans in the United States and Canada whereas such incidents are more common in Europe and Asia According to historical records over 3 000 people were killed by wolf attacks in France during the 1600s to 1800s Indian and Russian wolves are most renowned for their cruelty and ferocity During World War I Allied troops struggled to hold back waves of starving wolves drawn by the scent of blood 7 Dogs are wolves' favorite prey — a rather surprising truth given that the two species actually share a common ancestry Moreover they are willing to mate with one another However there are wolf species that regard dogs as preferred prey Even large dogs become easy prey once they stray into a wolf's territory Even a small wolf can easily overpower a large dog thanks to its sharp iron-like jaws and lethal bites to the neck In Russia during the period following the collapse of the Soviet Union many unfortunate dogs were discovered dead having been used as food for wolves In the Middle Ages a deadly plague swept across Europe killing thousands of people They often pile up dead bodies to prepare for burial or incineration Naturally wolves are also drawn to them During that time the wolves' primary food source was the carcasses left behind by the pandemic Over time they grew accustomed to the new flavor and humans became the main course on the wolf's menu The number of wolf attacks on humans is rising at an alarming pace And from this point onward tales of werewolves began to spread among people captivating both hearts and minds growing ever more popular Just as in Europe the seasonal illness in America inadvertently made wolves feared enemies of humanity During this period wolves frequently attacked human settlements particularly areas inhabited by tribes Men suffering from impotence become prey to wolves Recognizing an easy food source the wolves grew bolder attacking human settlements and becoming a haunting obsession for people of that era Wolves typically hide in remote secluded areas such as isolated forests far from human habitation Wolves can eat almost anything to survive including animals that have been dead for a long time However in favorable living conditions with abundant food this wolf species tends to be quite selective They typically prefer large-hooved species such as deer and elk and they only feed on prey that is still fresh If they don't consume all the food they gather they simply abandon it without storing it for later This species of wolf is gradually evolving into dogs and is spreading across all of North America The wolf is the most successful species on Earth with a widespread distribution across the Northern Hemisphere When we talk about wolves we usually mean gray wolves large animals resembling dogs However in North America one wolf species has still evolved more successfully than the gray wolf in terms of distribution and survival Their habitat has not declined over the past century but has instead expanded by 40% This species of wolf is the gray wolf The grassland wolf can outcompete other carnivores in its region and has expanded its habitat by 40% over the past 100 years To accomplish this gray wolves were fortunate to possess all three essential factors First came the sharp decline of stronger predators like the gray wolf creating opportunities for the rapid expansion of the coyote The second factor is the rapid pace of urbanization Other wild animals cannot adapt to human society but grassland wolves can coexist with humans The final factor comes from a large number of companion dogs kept by humans as well as stray dogs They have once again joined with the prairie wolf providing the prairie wolf with a new genetic source and helping it overcome the bottleneck of inbreeding This enables them to grow in number rapidly The coyote is a medium- to small-sized wolf species native to North America Compared to its close relative the gray wolf it is significantly smaller with an average weight ranging from 7 to 20 kg In actual measurements the largest known prairie wolf weighed 34 kilograms He was a male wolf discovered in Wyoming United States in 1937 In appearance the gray wolf closely resembles the coyote However the grass wolf's muzzle is sharper and appears more refined with a slight resemblance to the fox Due to their wide distribution the coat colors of grassland wolves are greatly influenced by their environment For example the coat color of the prairie wolf which inhabits the remote western regions is predominantly grayish white While the coat color of the highland-dwelling grassland wolf is mostly a dull brown As a member of the dog family the gray wolf naturally lives in packs However they have a tendency to eat mixed diets more often and rarely hunt large hoofed animals As a result their group sizes are much smaller than those of North American coyote packs Most grassland wolf packs are small family groups or simply a single pair of male and female wolves Meanwhile grass wolves living in cities or suburbs typically hunt alone Occasionally unrelated grass wolves can form a relatively large group This typically occurs with lone grassland wolves or when hunting large prey Experience and past patterns have taught us tha Expanding human activity into new areas will reduce the natural habitats of wild animals And the general rule is that as humans advance animals retreat But this rule does not apply to the prairie wolf Over the past 100 years the grassland wolf's habitat has expanded by 40% and continues to grow In fact they are even expanding into the South American region People can often see them on the streets of the United States They aren't afraid of people scavenging leftover food like stray dogs and treating the city environment as their own home Over time they also figured out the rules for surviving in the city ow how to avoid vehicles when crossing the street nesting in the dark corners of parking lots and even jumped onto rooftops in Queens New York for a better view Today the prairie wolf inhabits most regions of North America Before 1900 they were found only in Mexico the western United States and a small part of Canada However in the years that followed the grassland wolf's habitat expanded rapidly And by 2016 when humans began seriously studying and surveying this species of wolf They discovered that the grass wolf had inhabited most regions of North America particularly in Central America The grassland wolf is found nearly everywhere Over the past century or so human civilization has advanced rapidly Yet clearly urbanization has not had a negative impact on grassland wolves In fact it has opened up a whole new world for them because most of the 40% area they expanded into consists of cities and suburban regions The rapid expansion of the grassland wolf population has significantly impacted human life In the end it remains a fierce predator Although there are very few incidents causing harm to humans However many people believe they pose a threat to children and household pets As a result in many places they have been hunted to eliminate the potential threat they pose Especially after entering the 19th century hunting methods were continuously improved From primitive hunting methods and trapping today's helicopter-assisted hunting techniques The United States kills 400 000 prairie wolves annually Yet it could not stop the population of grassland wolves from continuing to grow Why can grassland wolves develop so rapidly There are many reasons for this First in North America although there are no tigers or rhinoceroses there are other animals that resemble them such as mountain lions royal lions and repentant wolves In the habitat of the North American wolf grassland wolves and mountain lions compete for prey Competition among species is fierce and coyotes are often the underdogs However compared to the lion it is the gray wolves that are the primary predators of the grassland wolves The grassland wolf is too similar to the gray wolf in every way and its eating habits resemble those of the gray wolf more than those of the lion According to scientific research the number of coyotes in areas where gray wolves are present is about 30% lower than in areas without gray wolves A compromise is that in the 19th century due to human activities The gray wolf's habitat has been severely destroyed causing a significant decline in their population In North America wolves were still quite rare at that time By the 20th century gray wolves had disappeared from most regions And the absence of their competitor opened a golden era for the grassland wolf's development Moreover as the 20th century began people paid increasing attention to protecting animals and preserving the environment Many wild animal species are also beginning to thrive For example in the suburbs of certain U S states deer populations have exploded And those factors also prevent the favorable conditions needed for the grassland wolf's development Previously the coyote's den was a valuable resource for trade But in the latter half of the 20th century numerous regulations concerning animal protection were enacted and the North American fur trade market collapsed drastically reducing trade opportunities for prairie wolves And the grassland wolf population will have even better conditions to thrive In addition to favorable external factors the reasons behind the grass wolf's development to its current state are numerous It is also related to their own capabilities Most powerful predators often come out on the losing end But the grassland wolf seems to be an exception It is omnivorous and like a domestic dog it eats almost anything it can get its teeth into In the city they rummage through trash bins scavenging for leftover food Whether it's fruit peels bones rice noodles or even chili peppers and kumquats Grass wolves are all edible and never picky about what they eat The prairie wolf can quickly adapt to urban life Beyond their strong survival capabilities another crucial factor related to them is their inability to be reproductively isolated from gray wolves and dogs After rejoining gray wolves and domestic dogs the emergence of a new gene further enriched the genetic diversity of the coyote and avoided the complications arising from mating with blood pheasants Humans also actively hunted and killed prairie wolves Yet why can their populations still grow so rapidly The main reason is that this species has evolved to become increasingly similar and is now closely related to domestic dogs In reality they are two very similar animal species When in a given area grassland wolves are nearly hunted to extinction Under past patterns the population would grow slowly Even due to the effects of inbreeding the numbers would gradually decline However with the emergence of companion dogs and royal dogs Grassland wolves need not worry about this and their population can still grow rapidly Mating with gray wolves and particularly with domestic dogs ot only allowing the gray wolf to easily navigate the bottleneck of bloodroot mating and significantly enhance the ability to adapt to human society Many wild animals such as snow leopards dholes and royal foxes will face numerous challenges when kept in captivity They developed illnesses such as pneumonia bronchitis and enteritis after being confined However grass wolves not only do not fall ill after entering the city but on the contrary they become healthier and live longer