How do we know which animal is the smartest in the world?

No member of the animal kingdom can take algebra tests or write an essay that reaches an A. But that does not mean that animals are not intelligent. Some members of the animal kingdom have impressed with cognitive skills and motor skills.

Chimp

Chimpanzees are animals with "relatives" closest to humans. Nearly 99% of our DNA is similar to chimpanzee DNA, and it seems that chimpanzees also have some powerful abilities in the brain like humans. In a study published in 2007, researchers gave adult chimpanzees, adolescent chimpanzees and college students a cognitive test. The test involves remembering the list of numbers - from one to nine - on the touch screen.

Chimpanzees and students all saw the numbers in less than a second. After that, all were asked to remember those numbers and tell the researchers. Adult chimpanzees and humans have the same results, but juvenile chimpanzees excel in both adult chimpanzees and college students. They remember the position of each number with much higher accuracy. Researchers think these young chimpanzees use a kind of visual memory, which allows them to memorize with extreme accuracy even when they only glance at the numbers for a second.

Goat

Scientists have been thinking for a long time that goats are far smarter than their modesty. Finally, a group of researchers in Australia decided to put these animals into trial. To test, they prepared a tool box with fruit inside. To eat fruit, goats will have to use their teeth to pull the rope down, thereby activating a lever that the goats must use to raise their mouths. If you can do it, goats will eat that fruit.

Nine goats out of 12 goats succeeded after about four attempts. When researchers re-experimented with all goats 10 months later, most still remember how.

Elephants

Anyone who has interacted with elephants knows these animals are very intelligent. But how smart are they? Researchers have done many topics. It is found that elephants can understand the differences between languages ​​and know who is speaking, men, women or children.

How did they discover this? In Africa, only some tribes hunt elephants. Scientists distributed recordings of a group of elephant hunters, and a recording of a group that did not hunt elephants. When the elephants hear the recording of the elephant hunting group, they become frightened and leave the sound. But when they heard the voices of the non-elephants, they did not move nor change positions. Later, the researchers distributed recordings of the elephant hunting group that once scared them, but included the voices of women, children and men. Elephants only become frightened when voices come from men who hunt elephants.

Dolphin

The way scientists test the whale's intelligence is to show them mirrors. The idea behind this test is to determine whether a dolphin can recognize itself in the mirror. To find out, scientists mark a color mark on their bodies, then they place them in front of a mirror. Normally, if an animal recognizes itself, it will show signs of trying to remove the body, such as scratching or rubbing.

Many animals do not pass this test. When they see themselves in the mirror, they think it is another fellow animal and flee or try to fight or threaten.

But when researchers marked dolphins, they knew they were in the mirror, not like some other animals.

Crows

It's hard to imagine that a crow can be as intelligent as a human, even smarter. But scientists have carried out a series of studies proving that crows can solve the problem very well.

In one study, they gave the crow and the human the same puzzle: Put a toy floating on the water inside a tall glass, too narrow for the bird to put its beak down or let one small child reached in. Children under the age of eight are completely confused, and often can't figure out how to get toys. But the crows are not confused at all. They simply dropped gravel into the glass. Finally, the stones made the water at the bottom of the glass rise, bringing the toy to the top of the glass, and the birds could take it.

Bees

Bees are famous for honey and bee venom. But bees are also smart little creatures. Researchers have taught bees how to determine which horizontal line is in a straight line. When the answer is correct, the bee receives the reward as sugar syrup. The problem is, researchers only teach them how to define horizontal lines. So when researchers replaced the vertical lines, the bees flew away. They know there is no way to get rewards.

Octopus

Most invertebrates do not have the same intelligence as these strange shaped marine creatures. In an interesting study, researchers tested whether octopus could distinguish between two different people. They let two people interact with an octopus. A person who acts extremely friendly and one who is cold and strict. After a short time, when two people entered the living area of ​​the octopus, the octopus will ignore the stern, cold person to support a more friendly guest.