Bbc Dolphins Deep Thinkers
Language: English + Romanian + Subtitle
0:28:23 | 656 x 480 | DX50 | Video Bitrate : 1959 kbps | Audio Bitrate : 128 kbps 44100 Hz | 349 MB
Genre : DocumentaryAt the Institute for Marine Mammal Studies in Mississippi, Kelly the dolphin has quite a reputation. All the instituteÂ’s dolphins are trained to hold onto any litter that falls into their pools until they see a trainer, when they can trade the litter for fish. Kelly took this task one step further. When people drop paper into the water she hides it under a rock at the bottom of the pool.
The next time a trainer passes, she tears off a piece of paper to give to the trainer. After a fish-reward, she goes back down, tears off another piece of paper, gets another fish, and so on. This behaviour is particularly interesting because it suggests that Kelly has a sense of the future and delays gratification. She has, in effect, trained the humans.
Problem-soving with tools
Despite their lack of hands, dolphins can also use tools to solve problems. Scientists have observed a dolphin trying to get a reluctant moray eel to come out of its crevice by poking it with the spiny body of a dead scorpionfish. In Australia, bottlenose dolphins place sponges over their snouts as protection from the spines of stonefish and stingrays as they forage over shallow seabeds.
Many species of dolphin live in complex societies. To keep track of the many different relationships within a large social group, it helps to have an efficient communication system. Dolphins use a variety of clicks and whistles to keep in touch. There is currently no evidence that dolphins have a language of their own. But weÂ’ve barely begun to record all their sounds and body signals let alone try to decipher them, and so there are certain to be a few surprises in store.
Communicating with sign language
At Kewalo Basin Marine Laboratory in Hawaii, Lou Herman and his team have developed a sign language to communicate with the dolphins, and the results are remarkable. Not only do the dolphins understand the meaning of individual words, they also understand the significance of word order in a sentence. For example, they generally responded correctly straight away to “touch the frisbee with your tail and then jump over it.” This has the characteristics of true under- standing, not rigid training.
In the BBC programme Wildlife on One: Dolphins – Deep Thinkers?, one of Lou Herman’s dolphins, Akeakamai, watches David Attenborough on an underwater tv screen. No one could predict how she would react, but as soon as David appeared on the screen, she responded correctly to his sign language, and even had a go at imitating him.
Despite inhabiting a very different world to ourselves, dolphins perform brilliantly in our ‘intelligence tests’. There is still much to learn about these flexible problem-solvers, but from the evidence so far, it seems that dolphins do indeed deserve their reputation for being highly intelligent.
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