Contender is definitely well-armed and dangerous . It may look terrifying, but the octopus isn't attacking the diver . It's just collecting data .
That's because each tentacle has a mind of its own, and every sucker can taste and touch .
By covering the diver in this sensitive embrace, the octopus is just trying to learn as much as it can .
It's number four in the countdown because its central nervous system is so big and so complex it rivals that of many birds and fish . In fact, the octopus is one of the fastest learners in the world . but measuring its intelligence is difficult .
If it was a human, we could use an IQ test, and if it scored well, it could become a member of a very special club .A battle of wits between intelligent octopi, clever crows, and wise monkeys . But stay tuned, because coming up is an animal that really gives us an earful . That's next on The Most Extreme .
In our countdown of extreme smarts is the dolphin . Off the coast of Brazil, the dolphin's big brain brings it up close and personal with fishermen .
But the catch of the day isn't dolphin . It's mullet that the dolphins have herded close to shore .
Like underwater sheepdogs, (relaxed music) the dolphins even signal to the fishermen when to cast their nets, and in return, the dolphins get to eat the mullet missed by the net .
It's a really clever trick that humans and dolphins have been practicing in Brazil for several hundred years .
But learning this behavior is no problem for the animal with the closest thing to human intelligence in the sea .
Like us, dolphins are highly sociable animals .
They learn by playing games, and one of their most popular sports is seaweed soccer . Scientists working with dolphins have discovered that these skillful swimmers are so smart they may even be able to recognize themselves as individuals . This kind of intelligence is only seen in great apes and humans . (upbeat music) But it isn't easy trying to figure out just how smart dolphins are .
In the past, some people have tried to measure intelligence by taking a close look at the skull .The dolphin actually makes far more noises than we can hear . It fires off ultrasonic clicks and whistles like a submarine using sonar . By listening to the echoes of these ultrasonic sound waves, it can build up a sonar picture of the world around it . The beauty of ultrasound is that when it contacts a fish, some of the ultrasonic waves can pass right through the skin .
The beam may then reflect back off the bones or guts, resulting in a number of different echoes .
Some scientists believe that these echoes are processed in the dolphin's brain to form a 3D image of the fish, which explains why the dolphin's brain is so big . It takes a lot of brainpower to be able to hunt by ultrasound .
At the Honolulu Zoo, but this is no ordinary dinner party . Part of the zoo's enrichment program is to turn lunchtime into a lesson in problem-solving .
But number two in the countdown definitely won't starve, for chimpanzees can sometimes be just as smart as us . But that's hardly surprising, given that we share up to 98% of our genetic material .Most chimpanzees will be lucky to reach the intellect of a four year old human . Hardly surprising, since even a four year old has a brain three times the size of a chimp .But chimpanzees are still clever enough to copy the most important human skill of all . They make tools . Wild chimpanzees produce over 20 different types of tools .
This hammer and anvil may look simple to us, but it can take up to six years to develop the proper technique .
In our countdown of extreme smarts is the parrot . This is a kea, a mountain parrot that lives in the Southern Alps of New Zealand .
So what's so smart about this bird? As a part of an international test of animal IQ, the kea was challenged with a seven-stage puzzle .
To get the food, it had to pull levers, push buttons, turn handles, and pull out a wooden cart . Up against the best brains in the animal kingdom, the parrot couldn't wait to get started . In a little over a minute, the parrot won the food and the competition . In these mountains, it's the kea's playful curiosity that gives them the edge . That's how they discovered that shearwater burrows contain nutritious meals . Unfortunately, a young kea also has to learn that making an omelet isn't as easy as it looks .
Thanks to a remarkable brain and a beak like a Swiss Army knife, the kea can crack even this puzzle .
But when it comes to smart parrots, one really stands out from the flock . is estimated to have the problem-solving skills of a six year old child, and all this with a brain the size of a walnut .That's why the parrot is number one in our countdown of extreme smarts .
For when it comes to thinking, the parrot really is the most extreme .
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