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Ravens are surprisingly intelligent

A recent study by the University of Cambridge on the behavior of crows has shown that these birds use certain tricks to get feed.

Two thousand years ago a fable of Aesop told us that a thirsty crow could not reach the water that was at the bottom of a jug of long narrow neck. Ingenious, picked up a pebble and threw it into the jar and then saw the water level was near its peak. repeated the process several times until he got drinking and save his life. The fable of the crow and the jar was used by Aesop to highlight the moral teaching of that necessity is the mother of all inventions.

A group of British researchers, led by some members of the University of Cambridge, have studied a very similar situation but with crows. The experiment was conducted with four black crows. Cook, Fry, Connelly and Monroe were placed in front of a glass with a long neck and deep water with a floating worm, a distance that was beyond the peaks of the birds. Beside the recipient a handful of stones, just as it had in the Greek fable, which have been used by the Ravens to increase the water level and thus achieve find the worm. As can be seen in a video of the experiment (http://www.vimeo.com/5974322), Cook and Fry did it the first try, while Connelly and Monroe needed to try again. The images show how the birds pay much attention to his actions: first, evaluate the level of the water, watching the container side and on the other hand, using, successively, the number of stones necessary to achieve the food with peak.

evidence that the result is not due to chance, demonstrated when he repeated the experiment by introducing a second container filled with sand. None of the four returned to rely on the glass of water. Indeed, the researchers could not help but be stunned by such a reaction.

"Crows are intelligent animals and they are surprisingly a degree to compete with the great apes in the ability to solve problems," account Christopher Bird, author of the study to be published in the pages of "Current Biology"

images Internet News

described in "Il Corriere della sera"

translated and adapted to blog by Franziska

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