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Episode 11: The Persistence of Memory Contents: 1. Opening Bits, the basic units of information 2. Intelligence The diversity of life in the oceans 3. Whales Whales and their songs The disturbance of the whale communications network by humans Whale hunting 4. ...
Carl Sagan:
But the grandest creatures on the planet...the intelligent and graceful masters of the deep ocean...are the great whales.They are the largest animals ever to evolve on the planet Earth.... larger ,by far,than the dinosaur. Their ancestors were meat-eating mammals who migrated....70 million years ago in slow steps from the land into the waters. Whales ,like these humpback,are still mammals. We humans have much in common with them. Mothers suckle infants... there's a long childhood when adults teach the young... and there's a lot of play. These are mammalian characteristics. Vital if an animal is to learn.But the sea is murky. The senses of sight and smell...which work well for mammals on the land...are not much use here. So the whales evolved as extraordinary ability...to communicate by sound.For tens of millions of years,the whales had no natural enemies.And then, a new and alien and deadly creature...suddenly appeared on the placid surface of the ocean.These often noisy and occasionally deadly objects...first appeared in large numbers only a few centuries ago.They are artifaces...manufactured by land creatures... whose ancestors last lived in the oceans...350 million years ago.
http://www.youtube.com/watch?v=4Lm3be1ORmw&feature=rec-rev-rn-1r-1-HM
But the grandest creatures on the planet...the intelligent and graceful masters of the deep ocean...are the great whales.They are the largest animals ever to evolve on the planet Earth.... larger ,by far,than the dinosaur. Their ancestors were meat-eating mammals who migrated....70 million years ago in slow steps from the land into the waters. Whales ,like these humpback,are still mammals. We humans have much in common with them. Mothers suckle infants... there's a long childhood when adults teach the young... and there's a lot of play. These are mammalian characteristics. Vital if an animal is to learn.But the sea is murky. The senses of sight and smell...which work well for mammals on the land...are not much use here. So the whales evolved as extraordinary ability...to communicate by sound.For tens of millions of years,the whales had no natural enemies.And then, a new and alien and deadly creature...suddenly appeared on the placid surface of the ocean.These often noisy and occasionally deadly objects...first appeared in large numbers only a few centuries ago.They are artifaces...manufactured by land creatures... whose ancestors last lived in the oceans...350 million years ago.
http://www.youtube.com/wat
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