And this is where it went. In places all around the eastern Mediterranean the sea is separated from the mainland by strips of flat marshy land like t… - David Attenborough

And they noticed what few others had done – that all over the world, charismatic animals that were once numerous were beginning to disappear. The Arabian oryx, which once had been widespread all over the peninsula had now been reduced to a few hundred. In Spain, there were less than a hundred imperial eagles. The Californian condor was down to about sixty. In Hawaii, a goose that had lived in flocks on the lava fields around the great volcanoes were reduced to fifty. The strange little rhinoceros that lived in the dwindling forests of Java – to about forty. Wherever you looked there were examples of animals whose populations were falling rapidly. This planet was in danger of losing a significant number of its inhabitants – both animals and plants.

It's equally astonishing that the birds are able to measure its relative strength with such accuracy that they can trace it back to its source simply by sensing in which direction it becomes marginally stronger. But a turkey vulture is exceptionally well-equipped among birds, with wide-open nostrils and extremely well-developed sense organs within them.

It used to be said, that in places like this, nature eventually failed to support man, the truth is exactly the reverse, here man failed to support nature. Ten thousand years ago man regarded the natural world as divine, but as he domesticated animals and plants so nature lost some of its mystery and appeared to be little more than a larder that could be raided with impunity.