Why are koalas able to make very loud and low sounds? Detailed answer

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Why are koalas able to make very loud and low sounds? Detailed answer

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Why are koalas capable of making very loud and low sounds?

The sound made by mammals is produced in the larynx by the passage of air through the vocal folds. The larger the size and weight of the folds, the lower the sound can be, which is why small animals usually squeak and are not able to trumpet like elephants. The only exception are koalas - during the mating season, males can attract females with very loud and low sounds up to 27 Hz. They succeed in this due to an additional pair of vocal cords located at the confluence of the nasopharynx and oropharynx and significantly exceeding the size and weight of the laryngeal folds.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

Who made the first engine?

An engine is a unit that converts energy, usually heat, into mechanical work. For a long time, people worked by hand before the engine came to the rescue. At first they used the power of animals. Then they learned to use the power of the wind as a source of energy, which inflated the sails and turned the windmills. The mill was a kind of engine, pumping water and grinding grain. The energy of the falling water did the work of turning the water wheels.

Our entire civilization began to change when people learned to use heat as a source of energy in an engine. The first fact that the heat obtained from a fire was used to drive an engine took place about 2000 years ago. The Greek philosopher Heron made the first steam engine. However, he was too small to do any work.

In 1705, the Englishman Thomas Newcomen invented the steam engine. It was used to pump water from coal mines. However, the engine consumed a lot of fuel. In the XNUMXth century, James Watt made an improved engine. He came up with valves that worked so that no one had to stand by and operate them. The valves automatically caused the pistons to rise and fall.

In 1803, Robert Fulton used a Watt steam engine as a steamboat propulsor. In 1820, George Stephenson built a steam engine in England. The steam engine was very heavy, since the combustion of fuel took place in a furnace located separately from the steam boiler.

The gasoline engine, which was developed by the German Nicholas Otto in 1878, was the first step towards solving the problem of weight. This engine did not need a separate firebox and was much lighter than a steam engine of the same power.

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