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evolutionary biologist at Ohio State University School of Medicine John Vince plug Wesson said: "The hearing is the most important function of modern whales, toothed whales whales, such as dolphins, is to rely on auditory echolocation to catch food, and a blind dolphin can easily find food, and a deaf dolphin on Only hungry. "However, farther and faster underwater sound transmission, which for the animals on land, it evolved to adapt to a hearing of the marine environment is a great challenge
Dolphin Tales 2 blog also get this from the article that on land, full of sound through air the external auditory canal and strike the eardrum mammals, but not when a mammal into the water, the water is full of the ear canal, eardrum gradually reducing the ability to pass sound. Listening to another challenge is underwater acoustic distortion, water the sound is very easy to spread through the body of an animal through the skull to reach the ears of the organization as a result, the sound of collision both ears simultaneously, making it impossible to find out the origin of the sound direction. (We humans are to reach the capacity we each ear by sound to determine the direction and speed of the sound.)
Dolphin Tales 2 blog also read that modern whales already have strong adaptability makes them overcome these difficulties, and as to how the evolution of these characteristics is, until the new fossils have been found before is no longer a secret.
Research Group He said four groups of early whale fossils from Pakistan can explain the evolution of whales underwater life while adapting to their ears in the earliest whales had ancestors 50 million years of history of the sediments found little in common with the modern whales The earliest ancestor of whales is the size of a wolf-like land predators, they are closely related to cattle, pigs, antelope and some other hoofed animals, but its skull features fully proved that they are the ancestors of whales. The new fossil shows that the earliest ancestors of whales very similar ear and land mammals, which poor underwater hearing ability just like Dolphin Tales 2 blog read.
The researchers recently discovered deposits of fossil whale 4300-4600 million years ago, these whales have evolved features some modern whales ear. From the analysis of the fossils that, when the whales have short legs, long tail and long mouth, similar size and otters; some have strong hind legs, these whales should be distributed to the world's tropical oceans of the first whale, but they all have a common characteristic is that they have evolved a system that can detect underwater sound and vibration transmitted to the ear through a layer of fat jaw, but they still retain the external auditory canal for onshore hearing.
Researchers by 40 million years ago, we found the whale species, which have evolved out of one of the key features of modern whales ear. These huge snake-like whale only slight hindlimb, and their life has been without water.
These up to 18 meters mammals finally have the air bag may be all sides and each ear sound isolating, this adaptation so that they have a high-precision positioning capability underwater sound evolutionary process whale ear to show the land mammals huge shift aquatic animals, auditory mechanism of modern whales just because ample fossil evidence only be deciphered in recent years.That's our short info about dolphin evolution,thanks for read one of Dolphin Tales 2 article.
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