At a luxury lodge in Zambia something bizarre is happening; - a phenomenon that has the world's elephant experts stumped. Every year, tourists flock to witness an extraordinary event: Six wild elephants, led by a matriarch called Wonky Tusk, climb the stairs of the lodge and enter the foyer. The giants stroll past the reception desk and through the dining room. Their destination is a 100-year-old mango tree growing in the courtyard and the fruit that falls from its branches. This "check in" is accomplished without as much as bumping a tea-trolley or breaking a crystal...