On the fringes of the Sahara, Grevy's zebras battle over dwindling rivers while, within its heart, camels seek out water with their herders' help. And tiny barn swallows navigate across thousands of square miles of barren sand to find a solitary life-saving oasis. One of the strangest creatures, the naked mole rat - or, as Attenborough puts it, a 'sabre-toothed sausage' - avoids the heat by living a bizarre underground existence. Its subterranean behaviour is caught on camera by using special filming tunnels.The only animal which can take on the midday sun is the silver ant, but it needs a 'spacesuit' to do it. Eye To Eye sees another crew struggle with the heat to film the speedy silver ant.