Who are the ancestors of cetaceans, depict them specifically

Whales were originally dog-like animals that lived along the coast. Later, food was scarce, and the ancestors of whales could only start touching water to obtain things. Over time, whales will be able to live in the water. Later, he began to move to the sea to liveGive points.

It was estimated to be the size of a modern cow or sheep, with the head of a mouse and strong limbs.

At the beginning of the 21st century, scientists found fossils of two mammals that lived about 50 million years ago in Pakistan. The two animals look a bit like dogs, the size of a wolf and a fox, respectively, but scientists believe they are the ancestors of the largest animals on Earth, the whale.

In the early Tertiary period, 50 million to 65 million years ago, all mammals lived on land. Therefore, modern aquatic mammals such as whales and dolphins must have evolved from some terrestrial mammals. However, due to the lack of fossil evidence, the question of which mammals are the ancestors of whales remains unanswered.

The anatomical morphology of the two fossils newly discovered in Pakistan suggests that the two animals lived on land, had carnivorous teeth, and looked a bit like dogs, but did not belong to the canine family. They have longer tails, more ferocious mouths, and smaller eyes than dogs. They have several peculiar bones in their ears that closely resemble bones unique to the same parts of cetaceans.

The ancestor of the whale was the meso-clawed beast. The ancestors of whales were originally terrestrial animals, and then gradually evolved into amphibians, and then into fully aquatic animals, an evolutionary process that began about 50 million years ago, and many branch species evolved from them.

Whales are not fishes, but mammals, and the modern blue whale can reach a length of up to 33 meters, making it the largest mammal and the largest animal that has ever survived on the Earth's Cover Trap.

Since the clawed beast was a houngulate in the ancestor of whales, even though the appearance is very different, the closest relationship with whales among modern creatures is the hippopotamus.

According to the fossils that have been discovered, the first cetaceans to appear were Protocetacedae, a transitional species that had evolved to snort and suck holes, but still had hind limbs and had a strange appearance.

Whale ancestors: ancient mammals, primitive whales.

50 million years ago, modern morphic whales began to evolve from wolf-like ancestors on land, and it took 15 million years for them to fully evolve into aquatic behemoths, a process that has a complete fossil record. A series of well-preserved fossils from India and Pakistan have helped scientists figure out how whales evolved limbs, teeth, kidneys and other organs that adapt to the stressful environment of the ocean. Now, the newly discovered fossilized ear bones reveal for the first time how the ancestors of whales and dolphins evolved a subtle and keen sense of underwater hearing.

For whales, as they adapt to life on the water, they must have the ability to hear underwater and accurately determine the direction of sounds.

The team said four groups of early whale fossils from Pakistan could explain the evolution of whales' ears as they adapted to life underwater. The earliest whale ancestors found in 50 million-year-old sediments have little in common with modern whales, the earliest whale ancestors were wolf-sized terrestrial carnivores that were closely related to some hoofed animals such as cows, pigs, and antelopes, but their skull features fully prove that they were the ancestors of whales. New fossils show that the ears of the earliest whale ancestors were very similar to those of land mammals, and that they had extremely poor hearing ability underwater.

Researchers have also recently discovered fossilized whale sediments from 43 million to 46 million years ago that have evolved some of the characteristics of modern whale ears. Analysis of fossils shows that whales at that time had short legs, long tails, and long beaks, similar in size to river otters; Some also have strong hind limbs, and these whales are probably the first whales to disperse to the world's tropical oceans, but they all have one thing in common is that they have evolved a system that can detect the vibrations of underwater sounds and transmit them to the ears through a layer of fat in the jaw, but they still retain the external auditory canal for hearing on land.

Whales evolved from some ungulate carnivores 65 million years ago. The Pakistani whale of the Middle Eocene may have been the earliest whales. Their legs gradually degenerate into fins and become more and more fish-like. Eventually, it evolved into what it is now.