These fish can do math

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[EN VIDÉO] This fish holds its breath underwater!
Boxfish do not breathe regularly through their gills, but hold water in their cheeks for several minutes without inhaling or exhaling. A unique phenomenon in fish.

Zebra mbuna a . Is freshwater fish, It lives in Lake Malawi in east-central Africa. It is no more than ten centimeters long. It lives in colonies organized according to a well-established hierarchy. And, if it is harmful to us humans, it is not like, but then not at all, that an intruder tries to roam his territory.

stingray, she lives in the Atlantic Ocean and the Mediterranean Sea. Tail included, it can measure up to two meters and fifty. It is a solitary fish that prefers to hide in the sand. And if you approach her, she may get scared and straighten her tail sting to sting you and give you a venom that can be fatal.

Presented this way, these two fish have nothing in common. Although…

Before we proceed, it seems important to clarify that researchers have known for some time that some fish have a sense of numbers. They are not alone in this matter, in the animal world. away from there. It is present in all classes of ability spine, and in some invertebrate, For example, bees. They are also capable of performing simple calculations.

What if the bees — spiders Also, it would seem – how to do it, so why not fish? Researchers have asked this question. And to answer that, he chose to work with… zebra mbuna and stingrays. Because, in terms of numbers, these two are surprisingly very similar to us. One shotEye A small amount of coins on the ground and immediately they know how many there are. Probably without needing to actually count.

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an astonishing ability

So the researchers wanted to know whether they could classify these fish as A. can train in short math games, Practice adding and subtracting. Very easy. Operations that involve simply adding or removing “one” from the initial quantity. And it worked!

How? ‘ or ‘ what? following the same drafting was used to show the counting abilities of bees. researchers presented geometric shape To the fish with a code Colour : blue for addition and yellow for subtraction. So when the fish were presented with four blue squares, they had to go into a group of five squares. He is four plus one. Of course, with a gourmet reward at the end of the day.

To make sure the fish had not overestimated the blue, the researchers presented them with three blue squares with the option of choosing between four or five squares. Fish made the right choice. Proving that they hadn’t learned the rules “Choose the largest – or smallest – amount”but the rules “Add – or subtract – one”,

Surprisingly, the fish remained strong in the calculations, even when the researchers presented them with objects of various shapes. Understand that a char can very well be represented by a small and large circle, a square, and a triangle. proof of a working memory Incredibly efficient for these little animals who don’t even have one cerebral cortex, this part of Brain Involved in complex cognitive functions in mammals. And those who do not have priority to develop such capability in nature. Another proof that zebra mbuna and stingray… aren’t stupid!

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