It’s not a fair fight but this gentoo penguin in the frozen wilderness of Antarctica makes a defiant stand against its main predator the leopard seal. The stunning image is from Sir David Attenborough’s new series Seven Worlds, One Planet, celebrated with a glorious picture special in today’s Daily Mail Weekend. Other photos released before the series, which begins next Sunday, show a cameraman filming elephant seals in Antarctica, and a group of golden snub-nosed monkeys huddling together in eastern China. Sir David in Kenya with one of only two northern white rhinos, both female, which survive in the wild. His new show, Seven Worlds, One Planet, starts on BBC One later this month Why don’t polar bears eat penguins? The riddle is probably as old as any other that you will find in a Christmas cracker. And the answer is not difficult to work out: penguins and polar bears live at opposite ends of the world and never meet. Pictured, in mortal danger, a penguin tries desperately to escape the clutches of a leopard seal in Antarctica The series, which has been four years in the making, puts a conservation message ‘at the heart’ of each episode. Speaking at…