The ocean covers more than half of the surface of the planet and is a home for an incredible number of living organisms. Including it is in the ocean that the largest, most noisy animals on Earth live - blue whales, writes iflscience.

Avoid predators is one of the most important tasks for many representatives of the animal world and it is necessary even to the ocean giants, such as mustachioed whales. Previous studies have already shown that the killer whales, in fact, are the only natural predators of the largest animals on the planet. But now, scientists also found that some types of whales can whisper in the ocean to avoid meeting with killer whales, hoping to slip unnoticed.

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During the study, scientists grouped various types of whales, depending on their reaction to the mittle. In total, they all act in one of two ways:.

The results indicate that the North Atlantic smooth whales, Greenland whales, hunchbacked and gray whales are going on to battle. Representatives of this group are slow, give birth to cubs in shallow water and remain to protect their offspring. At the same time, blue whales, finvals, saivals, small stripes and stripes of Bride choose “flight” - they move faster, and therefore bear the cubs in the open ocean, and also try to run away from the wages.

It is curious that whales who choose flight are also those who make one of the most loud sounds in the ocean. As a rule, killer whales can hear them at a distance of more than 1 kilometer. Previous studies have already shown that killer whales cannot recognize sounds in the ocean with a frequency of less than 100 hertz and can only hear very loud sounds below 1,500 hertz.

According to the author of the study by Trexor Branch, whales who choose flight, as a rule, produce noises with a frequency of less than 1,500 Hz and are the so -called "

Scientists came to the conclusion that strategies for struggle and flights definitely developed in response to the predation of the wands, since mustachioed whales simply do not have other natural predators. While combat species gather in groups for propagation in shallow water, they often use their safety in numbers and will actively protect the cubs together. This is convenient for propagation, since whales do not need to swim far to find a couple. However, the males of the whales must impress females with their songs.

Whales who choose the flight found something like a compromise: they sing loudly enough to attract a female, but not so loud that the wanders can find them. Researchers also found that this group of whales can scream at lower frequencies - this allows the sound to spread further, but not to give out the location of whales to predators.

According to the Branch, super-striped-heighty songs of flying species, such as blue whales and finvals, are an ideal tool: they can attract a female from a distance of hundreds of kilometers, while remaining acoustically invisible to the wagons.

Considering studies of various types of whales and their songs, the study showed that species that can fly " All species capable of fighting were physically able to produce sounds below the hearing range of the wanders, but instead shouted in a wide frequency range.

The results also showed that the largest view on the planet - blue whales - are able to slip away from the killer whales, making sounds that predators cannot hear below 80 Herz. The same applies to the Finvals that shout at frequencies even lower than blue whales. It is curious that the gray whales that can fight also do not shout above 1,500 Herz - scientists believe that this is due to their migration.

Previously, Focus wrote that scientists learned to track the most secretive animals in the ocean.