|
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese|
BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
How do frogs croak? Detailed answer
Directory / Big encyclopedia. Questions for quiz and self-education Did you know? How do frogs croak? If you have ever lived near a pond, you must have often been surprised by frog concerts. The sounds they make at night are loud enough to keep you awake! Female frogs can make some sounds if they are injured in any way, and the well-known croaking that we hear at night is made only by males. The main purpose of these guttural songs is to attract the attention of females. But they don't limit their croaking to just the mating season. Their voices can be heard long after the end of this period. How does a frog make croaking sounds? She (or rather, he) inhales air, closes her nostrils and mouth and drives the air back and forth between her mouth and lungs. This sound is made when air passes through the vocal cords and causes them to tremble. Many species of frogs have sac-like resonators that are connected to the mouth. When the frog starts its song, the resonators fill with air and swell. These swelling pouches are what give the croak its distinctive sound. Speaking of which, the voice of the American bullfrog sometimes travels a mile or more! Although the adult frog has lungs, it breathes with them in a completely different way than we do. She draws air into her mouth through her nostrils while lowering her throat. The nostrils then close and the frog raises its throat again, thus pushing the air further into the lungs. Did you know that a frog uses its eyes when swallowing food? As you know, frogs catch their prey with a sticky tongue. When an insect sticks to the tongue, they pull it into their mouth. The frog's large, bulging eyes are separated from the oral cavity only by thin skin. When they close, they protrude inward. That is, the frog closes its eyes when an insect enters its mouth, and the internal bulges help push the food down the throat! Frogs are very useful to humans because they eat insects and reduce their number. Author: Likum A.
How did forks come about? The first person to use a crude form of a fork while eating must have lived thousands of years ago. However, the fork we use at dinner is a very recent invention. As a fork to eat meat, primitive man used a small forked branch. Some reputable scholars believe that the fork appeared at the same time as the arrow, and at first it was used as a toothpick. The forks familiar to us were originally used only during cooking: they held the meat when it was cut. The first forks were long, with two prongs, they were made of iron, bone, hard wood. It took quite a long time before forks were used at the table for eating. Even 300 years ago, forks were a rarity in Europe. Indeed, in France, people ate with their hands until the XNUMXth century. We have all heard of the magnificent court of Louis XIV and the feasts in his palace. Did you know that none of these elegant courtiers used forks? When some people began to eat with forks, others made fun of their excessive finesse. When a rich lady from Venice in the XNUMXth century made herself a small golden fork to order, they wrote about her: “Instead of eating like other people, she has to cut food into small pieces and eat them with a two-pronged fork.” 500 years have passed, but even in the XNUMXth century in Venice, people who used forks were still ridiculed as eccentrics: "In Venice, in addition to a knife and a spoon, every person is served with a fork to hold the meat when you cut it, as they It's considered bad manners to touch meat with your hands." Since the XNUMXth century, the rules of behavior at the table began to correspond to modern ones. Silver forks spread throughout Italy. And by the end of the XNUMXth century, the fork became simply necessary in the homes of cultured people.
▪ What is the pleasure center and where is it located in the body? ▪ What did Nero do while Rome burned? ▪ Who is scientifically described as a typical member of the Homo sapiens species?
Machine for thinning flowers in gardens
02.05.2024 Advanced Infrared Microscope
02.05.2024 Air trap for insects
01.05.2024
▪ Nanotechnology in the circus ▪ Stem cells have been trained to produce insulin ▪ Passenger aircraft without windows ▪ The electric car is charged through the antenna
▪ section of the site Aphorisms of famous people. Article selection ▪ article Bonfires and hearths. Basics of safe life ▪ article Who owns the Statue of Liberty? Detailed answer ▪ article Road worker. Standard instruction on labor protection ▪ article Converter 12/220 volts. Encyclopedia of radio electronics and electrical engineering
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua |
Random interesting fact from the Great Encyclopedia:
See other articles Section 
Latest news of science and technology, new electronics:
All languages of this page