They range from 1 billion to 1 billion.
Wandering in the northern hemisphere 200 million years ago.
By 55 million years ago, these predatory carnivores had produced Canasias, a wolf-like animal whose jaws could tear and devour meat.
A member of the Mikassis family existed 600,000-550,000 years ago and is considered by mainstream scientists to be the common ancestor of all wolves, dogs, bears, raccoons and weasels.
Rebuild the basic carnivore MiACIS, which existed 600,000-550,000 years ago and is considered to be the same ancestor of wolves, dogs, bears, raccoons and weasels.
About 45 million years ago, until about 2 million years ago, a large species named Xiong Ke roamed in North America, Europe, Africa and Asia, enjoying a hunting plane with anis Lupas, one of the close relatives of modern gray wolves.
About 25 million years ago, a species called Canidae split into two evolutionary branches, resulting in African hounds and Eurasian wolves and dogs.
At this time, in North America, a terrible tomahawk ruled on the plain. It was equipped with sharp claws, a powerful biting chin and a long tail, and kept a balance in hunting and fighting.
Most theories show that wolves are attracted by food scraps discarded by human hunting settlements, and this species has evolved into a better scavenger than hunters.
The tame wolves that learned to eat scavengers thrived in the human camp, while the strongest carnivorous wolves were left behind. This theory is supported by Darwin's theory of natural selection.
Between 65438+ million BC and 8000 BC, early hominids and wolves liked forests and hunting plains, but the exact time when domestic dogs evolved from gray wolves (canine wolves) is still unknown.
Until about 20 10, most experts thought that domestication occurred before 14000, but the study of dog mitochondrial DNA strongly showed that they evolved at the same time before 100000.
The European grey wolf is in the zoo in Garrett Mountain, and the wolf is in Chabli (Chris Oxford/CC BY SA 4.
Archaeological and paleontological records show that gray wolves have existed for at least the past 300 thousand years.
In 2009, several buried dog skulls were found in a cave in the Czech Republic, dating back to 30000 BC! In addition, in 20 1 1 year, it was discovered that a huge mammoth bone was bitten out of the paleolithic dog's bone in 30000 BC, and its brain was carefully taken out at some time after death, which shows that it has ceremonial significance.
The discovery of another dog's skull and a body dating from 3 1000 BC in Raz Bogna cave in Siberia not only tells archaeologists that this man domesticated hunting dogs, but also played an important role in his supernatural belief system.
Paleolithic dog skulls can be traced back to 33 years ago, and a canine similar to a dog was found in Altai Mountain 1000 years ago.
(Nicholas D.
Susan Ovodov
Yaroslav Crockford
Kuzmin，Thomas F.G.Higham，Gregory W.L.Hodgins，Johannes van der Plicht/CC。
5) The relationship between man and dog was consolidated at the beginning of farming, and then people realized how fast it was to domesticate wolves with starch! Semi-domesticated wolves have sharp teeth, strong jaws and speed, which are used to protect small hunting stations. In return, they get companionship, protection, shelter and reliable food sources.
In 6000 BC, dogs were trained as effective farm tools and weapons for tribal fighting. These ancient skills are still obvious in different breeds of dogs today.
For example, police dogs, police dogs, military dogs, sheepdogs and rat-catching dogs. The rise of organized religion has led to the ritualization of dogs and rats, which is usually associated with the journey of the human soul in the afterlife.
In China, Egypt and South America, people worship dog gods. They are carved into statues and temples, which occupy a central position in myths and legends.
Evidence of dog ritualization was found in the skeleton of a 7-year-old male husky dog. A thousand years ago, in Siberia, he worked with human beings all his life, ate human food and was buried like human beings.
More importantly, a wild wolf is buried nearby, which may be considered as a mask without bijuu to protect human souls in their afterlife journey. Later, the clay was 49 cm high. 1585. Romer Pellizzer Museum in hildesheim.
Anubis was the god of the underworld, the leader of the ancient Egyptian jackal.
Around 2000 BC, in the Iron Age, Romans, Egyptians, Greeks and British people used dogs more and more in wars, bloody sports and violent entertainment.
Large dog breeds, such as mastiffs and wolfhounds, were found to be effective in war. In a 38-year advertisement, strabo, an ancient Roman historian, reported that "British large dogs were raised in their hometown of Britannia to hunt dangerous prey and war dogs.
When Rome conquered Britain in 43, a prosecutor named "Cynegii" was recorded as a dog who chose to export to Rome, either to compete in the arena or to join the Roman army as a war dog.
He mentioned a big dog with a big mouth, "surpassing Mollosi in Rome".
"Today, like many aspects of life, dogs have become extremely polarized. We have specially trained medical dogs that can detect cancer and odor when diabetics have hypoglycemia.
All this happened to the astronaut's dog.
In the space program and the training of search and rescue dogs, they will jump off helicopters and speedboats, not to mention military dogs that detect explosives and locate injured bodies in places that soldiers think are too dangerous.
One of the highlights of my research in this article is that in 1943, during World War II, the US Army started a "dog training program" to parachute puppies into the war zone to detect enemy tunnels and bunkers.
At the end of 1943, the navy commandos took reconnaissance dogs and messenger dogs to the front line in Bougainville.
(Public domain), what will dogs do in the future? In the modern police and army, dogs trained to bite often have their teeth broken. Now they are replaced by sharp titanium fangs, which cost between 600 and 2000 dollars per tooth. Is this the beginning of a new path of canine evolution? Like us, can dogs be synchronized with our computers and smartphones soon? In short, the evolution of dogs has spanned nearly 45 million years, and it is far from complete. Although in the past 200 years, we have irreversibly changed its evolutionary process through mass reproduction, so far, no other animal has evolved as harmoniously as dogs.
Above: A rock painting may depict a man with a dog.