Speaking of mammals, I believe many people will think of various terrestrial creatures, including us humans, and most mammals live on the mainland, do mammals appear in the oceans that occupy a large area of the earth? What were the earliest mammals in the ocean? What transformations and evolutions have these marine mammals undergone? Many marine biology researchers have been exploring these aspects of the problem for a long time, and have discovered the first process of mammals in the ocean, which appeared about 50 million years ago and was the first whale.
After some researchers examined the fossils found, it was found that those creatures from the mainland evolved into marine whales during the Eocene period (about 53 million to 36.5 million years ago), and these creatures took only 20 million years to grow from their original body to 2. 4 meters, living on the water's edge, feeding on fishing, walking mammals into whales of different shapes and sizes that currently exist in the ocean. In fact, researchers have found that these whale fish animals, the ancestors of this creature are medium beasts.
The mammal originally lived by the stream, and this creature is a mammal, and the researchers found that the earliest prototype of the whale fish may have been transformed step by step by this creature. In the process of evolution, the walking whale is one of the forms, researchers have found this animal in Pakistan, and it is a semi-terrestrial, half-marine animal type that appeared 50 million years ago, in this animal also has hooves that can be used to walk, and this creature has very large feet. After 3 million years of development and the transformation of the Lord whale, this creature is also 2.4 meters long, although this creature can walk on land, but at this time, they have a very streamlined body, but also have a whale-like tail.
10 million years after the appearance of the Lorde whale, at a depth of 15 meters from the surface of the sea, the ancient lizard whale appeared, which is a creature with very small limbs and almost no longer has any role in the limbs, and at the same time, there are dolphins in the sea.
The reason why in the field of science, many researchers believe that the ancestors of those marine mammals came from the mainland and evolved from terrestrial animals is because scientists have found a very complete cetacean skeleton in Pakistan, which researchers call the skeleton of the Bucky whale.
Through in-depth research on this skeleton, it was found that both from the hindskes of the skull of this skeleton and its limbs, it was very similar to the terrestrial even ungulates at that time, so it was believed that the earliest whale fish organisms were terrestrial, and it was only with the continuous changes in the living environment at that time that this animal had to enter the ocean and gradually evolved into marine mammals. Even the researchers have deduced that the important reason why this terrestrial animal enters the ocean is the change of the earth's environment, which was in the late Eocene, the earth's environment was very hot, but at this time the earth's environment was not so dry, and in some places that originally had dense rainforests, they gradually became very open places, which brought convenience to the lives of some mammals, so that the individuals of these mammals grew larger and larger.
However, changes in the Earth's environment are not very beneficial to every animal, and many carnivorous birds have disappeared from the earth very obviously, at this time a very fierce new carnivorous mammal has appeared on land, and these mammals are beginning to rule the entire planet. In the face of a very dry season, for those hoofed carnivores, there is no way to adapt to this change in the earth's environment in time, and the animal is also facing extinction.
In such a situation, the pregnant ancient lizard whale, coupled with the first time the oceans in the Antarctic and the Arctic have frozen, led to the disturbance of the ocean currents, for the ancient lizard whale, suffering a huge panic, in order to survive, this animal in the encounter with some small hairy whales, the animal as food. As a result, this animal slowly survives in the ocean.
Looking at the process of the development and evolution of the earth in the past, it is not difficult for us to find that every time the earth has some environmental changes or disasters, there will always be animal extinction, or the emergence of new species, some of which are evolved from the original earth organisms. Because of the continuous evolution and development of these earth creatures, there are colorful creatures in the natural world, and only then do they have the existence of various creatures at present, which together lay solid conditions for the development and renewal of the earth, and also let us humans have more understanding of various creatures and play an important role in the understanding of the entire natural world.