When you share your days with a mate in a zoo enclosure, it’s almost inevitable you’ll form a strong bond. This is certainly the case for these elephants in Lisbon Zoo, who conjure up creative new ways to pass the time together. One such activity, naturally, is taking your trunk on a mystery tour. Curiosity got the better of one of the pair one day, when he had a sniff up his mate’s bottom! Credit: YouTube/stickowe1