Can fish hear? Detailed answer

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Can fish hear? Detailed answer

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Can fish hear?

When you went fishing, have you ever tiptoed along the edge of a stream so as not to scare away the fish? If the fish hears you, then most likely it will swim away to another safer place - because the fish have ears, and they hear. But the ears of the fish are inside, and not outside, as we are used to.

People believe that fish do without some of the features that we consider vital. Perhaps this is because fish are cold-blooded. Or maybe because we like to fish, and we prefer to think that they do not understand what is happening to them.

But fish also have a nervous system, just like other animals. If we hurt them, they feel it, and if we hurt them, they feel pain. Fish have a very delicate sense of touch and taste. They sense through their skin and have two small olfactory organs located in their nostrils.

Just because fish are cold-blooded doesn't mean they can do without "fuel" to keep them going. "Fuel", of course, is food. It burns in the belly of the fish and provides it with vital energy. The blood carries to all the internal organs of the fish not only this energy, but also oxygen, which supports the "burning". To pump blood, fish, like us, have a heart.

Of course, fish live in such different conditions that they differ from each other in many ways. For example, lungfish have both gills and lungs to breathe in the air! Some species of fish that live in caves are blind and therefore have antennae on their heads. Some live in sea water, while others live in fresh water. And some fish live only at the bottom of the oceans.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

What animal was first domesticated by man?

a) a sheep.
b) a pig.
c) reindeer.
d) a horse.
d) a dog.

About 14 years ago, Neanderthal hunter-gatherers who lived on today's border between Russia and Mongolia learned how to lure reindeer out of large migratory groups and breed them separately, creating their own small herds.

The reindeer became for primitive people something like a walking shop, giving them meat, milk and skins for clothes. It is possible that during the same period, Neanderthals began to train dogs to help them domesticate deer.

Today, there are about three million domestic reindeer in the world, most of which live in the expanses of Lapland, stretching through Sweden, Norway, Finland and Russia.

Reindeer-herding Lapps prefer to call themselves "Saami". Perhaps they are simply unaware that "Sami" is translated from Old Swedish as "chavs".

In North America, deer are called "caribou". The word comes from xalibu, which means "one who digs" in the language of the indigenous inhabitants of Eastern Canada - the Mi'kmaq. The reindeer/caribou use their powerful hooves to shovel the snow and get to the lichen. Lichen (aka reindeer moss) makes up two-thirds of the diet of reindeer.

Reindeer are nomadic animals: every year they travel up to 4800 km - a world record among mammals. In addition, they are very fast: on land, a reindeer can run at a speed of 77 km / h, on water - 9,6 km / h. Because of the clicking tendons of the legs, the movement of a herd of migrating deer resembles a congress of castanets.

Below is an approximate table of the dates of domestication of the main animals.

Reindeer - 12 BC e.
Dogs (Eurasia, North America) - 12 BC e.
Sheep (South-West Asia) - 8000 BC e.
Pigs (SW Asia, China) - 8000 BC e.
Cattle (South-West Asia, India, North Africa) - 8000 BC e.

Domestication and domestication are not the same thing. The first involves selective breeding. Elephants can be tamed, but they are by no means domesticated.

Test your knowledge! Did you know...

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