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How dolphins communicate across sound
Transcript of How dolphins communicate across sound
In 1953 the under water explorer Jacques Cousteau observed that when his boat was heading along a deep channel of murky water , porpoised would follow him. Also if he steered off course the porpoised also steered of course but the immediately went back and followed the channel again. After seeing this Jacques thought that the porpoised could detect the channel without being able to see.
Today we know that dolphins produce clicks using the nasal sacs this makes the sounds reflect off objects and are picked up again in the dolphins lower jaw after this reflected sound waves travel through a channel filled with fat and then go into the ear. dolphins can also hear light sound waves and they are helped by a 'lens' made of fat that they use to focus sound waves . Some dolphins seem to be able find fish that are well-buried in sand and this has led some scientists to suggest that dolphins can also use ultrasound to see things in the same way an ultrasound scanner does. Today ultrasound waves are used in hospital to look inside people .
Scientists have made many experiments on dolphins and one of these was to put two dolphins separated into two different tanks. These dolphins even if they were in two different tanks, could still communicate and this shows that each dolphin has at least two emitters of communication, one in the nose and one on each side. Another experiment was that dolphins can easily find their way even if they aren't able to see. Dolphins can carry on a whistle conversation with his right side and a clicking conversation with his left side and do the two quite independently with the two halves of his brain.
Dolphins can imitate sounds and they have 186 different types of whistle.
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Dolphins are beautiful and intelligent creatures who have dominated the sea for many centuries. The main way in which these fascinating creatures communicate are through body language, sounds, whistles and also by making physical contact with each other. These sounds are most of the time high pitched, and each dolphin has a different vocal pitch: this is how each dolphin understands who it is communicating with. Communication is fundamental for a dolphin's life: it can help them identify nearby food and it can also help them indicate danger, like a nearby predator. Another important way dolphins use communication, is to locate objects: this is called echolocation, and dolphins are not the only animals to use it. This works because the high pitched or low pitched sounds bounce off th object and back to the dolphin, making it understand the distance of it. Finally, another way which dolphins use to communicate is body language: they use this to maintain observation of their surroundings one of the most common used is tail slapping
By Lorenzo Bianco, Matilde, Livia and Ginevra