The Singapore Zoo is one of the best in the world in terms of their efforts to recreate animals’ natural habitats. One step ahead of the others, it’s one of the only zoos to be entirely cage-free. Far from craning your neck and peering through the bars of a cage trying to see, here, visitors can eat with orangutans in their enclosure and even come face to face with a kangaroo – they are relatively tame so don’t be too worried.