Today we know of 42 Birds-of-Paradise, but if we went back to 1930, there were nearly 60 in the family. So where did those 20 or so birds go? They are sometimes known as the Lost Birds-of-Paradise, and still today they're a bit of a mystery. In this week's episode we're going to meet a couple, find out where they went and try to get to the bottom of these forgotten members of this most stunning family.