Today we're living in an era in which the biggest threat to human well-being, to other species and to the Earth as we know it might well be ourselves… - David Attenborough

Without thermals, [raptors] can't travel far. But the snow geese fly on... They navigate by the stars.

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.

The Roman public's thirst for blood and pleasure in witnessing pain seems to have been unquenchable and without limit. The caged animals were kept in dungeons below the main arena. The terrified animals in their cages were hoisted up from this pit. And not only animals, human beings too, criminals, slaves and prisoners of war. And here in this arena they were set one upon the other to provide the crowd with spectacles of the most appalling carnage. It still continues to this day in Spain.