 古蜥鲸
About 5000 million years ago, marine mammals for the first time with - the earliest whales.
The recent discovery of fossils tell us how a number of land animals evolved in the Eocene marine when the whale. In just 2000 years of time, the body length of 2.4 m at the water's edge to fish-eating mammals could walk into today on the development of the size and shape of the whale.
The animal is a class of mammals living in the stream edge, including the thickness of the beast. Lu Shengzu whale is probably the first animal from a class of animals that evolved. One of these ancestors walking whale, which is 50 million years ago, half-marine half-terrestrial animals. Walking whales found in Pakistan. They also used four legs walking on the hoof, but they have very big feet, you can play the role of webbed.
300 million years after walking whale, whale Lord appeared, it is 2.4 meters long, although it can still walk on land, but it was the body of a more streamlined, there is a whale swimming in the large as for flexible tail.
1000 years later, 15 meters deep into the ancient lizard whale home.
Its limbs very small, almost useless. At this time, the dolphins appeared. The same as today's dolphins, dolphins use sound in the sea early in the search for the road route.
"In 2000, when we, in Pakistan found a very complete, they named the whale skeleton named Bucky, from the skeleton is very interesting, after its head from the bone and the case of the limbs , then it is completely terrestrial with cloven-hoofed very similar to the earliest whales are terrestrial, and later because of the changing chemical life, it had to choose to enter the marine life. "
This time of year, armed toothed whales have gathered in the ancient Mediterranean north to mate. Several head male in the pursuit of an armed female toothed whales, and finally chose the other end it is the oldest, largest individual male to mate.
Extinction of the dinosaurs, those who once ruled the great ocean marine reptiles disappeared, and since then two thousand five hundred million years, sharks in the sea without any natural enemies. But now a new vicious monster appeared in the depths of the ocean.
Great whales come here say the whale does not include the ocean today by those gentle green living whales, when the whales are vicious killers.
This is the late Eocene, the Earth's environment is still very hot, but they were dry and a lot than before, so covered with dense rainforest before the place turned into the open now, due to no longer be bound by the thick bushes, and some mammals individuals grown very large in the low plains of the individual tree is a large advantage.
These changes are not beneficial to all animals, large carnivorous birds obviously gone, replaced in many of the continent is fierce new type of carnivorous mammals. Like mammals, dinosaurs, like the former rule the entire world, but they also face the most severe test, the Earth's climate has changed, even after such a day than to compare the climate fairly moderate.
The biological factors that adversely affect the environment than from the land, but produced in the ocean, affecting the most powerful mammals, here is the ancient "Tethys" and the ancient Mediterranean, which is a tropical ocean, horizontal across almost half the globe.
Mechanical toothed whale is a carnivorous whales, length 18 meters, height is 4 times the great white shark, which is a female whale weighs 60 tons, it is difficult to imagine the ancestors of an individual is very small, living in the body coat tree of mammals.
"In 2000, when we, in Pakistan found a very complete, they named the whale skeleton named Bucky, from the skeleton is very interesting, after its head from the bone and the case of the limbs , then it is completely terrestrial with cloven-hoofed very similar to the earliest whales are terrestrial, and later because of the changing chemical life, it had to choose to enter the marine life. "
This time of year, armed toothed whales have gathered in the ancient Mediterranean north to mate. Several head male in the pursuit of an armed female toothed whales, and finally chose the other end it is the oldest, largest individual male to mate.
Antarctic disaster is far from changing only the fate of female whales of ancient lizards, hundreds of millions of years, the polar regions, sea ice for the first time, the disorder occurred when the ocean currents. A whale requires 80 kg of food per day, while small changes in ocean fish is the whale will be a great impact, which rely on the survival of the first female whale appeared to be based on the collapse of the food, but this time it has been pregnant.
This is an Angle beast, is a large carnivore, and the horse high, weighing nearly a ton, in general, it is the foraging activity in the inland areas, but drought forced it had to come to the beach environment, this exhausted can be a threat to sea turtles, their eggs will survive the night production is just struggling to go back to the sea.
"Angle beast", its fossil in Inner Mongolia in the north of our country, that is, when the Eocene fossils are very common, we also found in North America, and the more complete fossils in North America, more abundant, from the It's fossils, we find from this type of "Angle beast" its teeth and jaws that situation, first of all it is the kind of teeth, with our comparison of living animals for meat is , very strong, the structure of the three sharp teeth from its lower jaw is very thick and powerful head of its individual mentioned here (two palatal) one meter long, like sea turtles in general this type of thing, it it was easy for things, including the first fossils found, we scientists think it is an old meat of things, and later in North America to find more things more complete, we found that animals with long such hoof, which makes Now we feel like eating meat, which fully meet the predator, it should be long claws, and we feel very strange, from which the hoof structure, researchers now have it from the old class has been put meat section of our class of ankle the ankle section of the sheep class is of this type of living of its ancestor type, it is now with us a long hoof of cattle and sheep this kind of relationship should be closer. "
The dry season especially for the survival of animals, carrion, but in the long run such a long time with the hoof of the predators can not adapt to climate change, extinction of this species also. Months later, disrupting ocean currents erratic swimming schools of fish line, making it the first female whales of ancient lizards usually have to feed it from outside the region hundreds of kilometers in search of food, it has been pregnant four months, the situation becomes more and more severe, knowing can not find food, it also had to try his luck.
South of the Mediterranean coastline along the ancient distribution of a myriad of mangrove swamps, in the Eocene period, where a very dense distribution of rivers, but believe it or not, then this becomes the world's most arid areas - Sahara desert. This is not the ideal ocean whale predation sites, but this is the first female whale has refused to take them, because here, after some food. In the labyrinth of tidal Gully, the size of its activities is indeed a huge obstacle, hunger drove to the inside of its swimming. Some primates on the branches down to wait and see, they are sub-provision of the monkey, is a highly social animal, if found dangerous, they quickly spread the.
Sub-provision of these monkeys left the sea tide Gully, to continue through the mangroves to find a fruit of a tree node. Because the results of different trees at different times, these primates are often swamp the beach back and forth, and this is very dangerous. Because there are sharks in the water frequently, crocodiles and other dangerous things, and now the whale.
Toothed whales mechanical trouble soon catch up with the ancestor of elephants, it was too anxious, the results themselves stranded on land. When the armed struggle to help themselves out of trouble toothed whales, when the ancestor of the elephant has escaped some of the river is more shallow, the hunger, armed toothed whales swim in any case, but here, for the whales, it can be as wide of mangrove swamps in the ocean easily.
"Ultralisk in Oligocene time was very successful, and its distribution area is very wide, but the success of the animal is often a particularly good time to adapt to climate and environment, just like the dinosaurs, it was in the Mesozoic when the dinosaurs have all corners of the earth, but it is actually developed to this point is developed to a limit, from its shape, it becomes very large, diet is also very simple, but this is a risk That is, once the environment changes, it is very easy to die, that is the reason why it perish. "
Another difference with the rhino's nose is growing out of Ultralisk that angle, neither keratinocytes nor hair, but an ancient mass angle, angle of this ancient quality more commonly used to display and not to contradict the This corner used to contradict, then if will be very easily broken. For the scavenger, the days to feel better, Ames beast trying to constantly attack Ultralisk mother to get it dead child, but she tried to protect their own children.
Mom is now difficult to say whether Ultralisk kids know it already dead, and other mammals, have a strong affection between mother and child, the mother will do everything possible to protect their children. Angle is now second only to the beast, it seems very difficult to guard against two enemies Ultralisk mother.
First to seize the opportunity Angle animals, after a long day of fighting, the mother has been unable to turn, it seems that it is ready to give up. Scavengers and other animals are generally reluctant to share the spoils of war.
Angle when the two animals and fish to compete for the beast to fight, the mother is moving to see their children, thinking small Ultralisk still alive, it bolted away, then into the battle to protect the child.
A few weeks later, the sea environment is not as signs of improvement, we can only call this ocean famine, this time, the ancient lizard whales growing fetus, it is the environment has reached a moment of extreme panic , it now can barely maintain their own life, simply unable to manage its body calf, which limited the fat stored in the body have been depleted, and its physical condition will force it to abortion, or the life of its own are not guaranteed .
Suddenly it came to stand around a group of individuals smaller whales, toothed whales called Mao, Mao toothed whales when many come together when the female whale that it Qizhong produced soon, it looks beautiful greeting is called, can actually not the case, these small toothed whale is the individual hair to harass whales large volume of ancient lizards, they are trying to rely on the large number of whales off the old lizard, is the hair of ancient lizards whales Toothed whales generally feed on pups, must have hair in the vicinity of the breeding origin of toothed whales.
Looks like a female mechanical toothed whales to be rushed to the sea, but its behavior from the truth, if you want a smooth survival of whale birth, the mother must do one thing than anything else, it must be rubbing the body, It is easy to reach on a sand drag the body to slough off the outer layer of skin, may be long in the outer layer of skin parasites and corals, rely on speed to hunt for the animals, and keep the body smooth, streamlined, predation key to success, and now it is ready prey of the toothed whales hairs.
Toothed whales have gathered each year to the hair of this lake to calm and safe delivery, the first whale has been born, just born a few days they are faced with extreme danger, the other end female mechanical toothed whales have been found in this small lake , Xiaomao toothed whales toothed whales found in the rapid escape armed adult hair toothed whales collective defense, they boldly attacked the ancient whale lizard trying to make it go away, they appear to have the results of collective efforts, mechanical toothed whales left. Now quiet again. However, this is only temporary.
After all, this is a hungry pregnant female whale, in the next few days, armed toothed whales, a trip and a trip back to the small lake from the shelter into a bloody killing field, this is the meaning of the food chain. Toothed whales, a few hairs in exchange for the life of the unborn the survival of small mechanical toothed whales.
Sadly, mechanical toothed whale mother and son experienced the beginning of the day but bad weather, bad weather caused the extinction of dinosaurs from extinction and another after the end of the Eocene. And the damage caused by a meteor, like the Antarctic and turned cold ocean currents cause a catastrophic change, like a huge El Nino, but even worse than the El Niño phenomenon many times, life on Earth died out 20% . Although the survival of cetaceans as a species over, but the mechanical toothed whales and its ilk been eliminated. |