Train passengers in France may have initially wondered if there was a technical error when they saw electronic billboards showing magnificent wildlife scenes – upside down. But if they paused for a moment they discovered that the elephants, penguins and so on were all inhabitants of the southern hemisphere, featured in the new France Télévisions wildlife documentary series: “One Planet, Two Wild Worlds”. Down there, it’s as if the animals are walking on their heads. But of course we’ve seen stranger things.