Love is in the air for Scotland's giant pandas -- with frisky male Yang Guang doing HANDSTANDS as the mating season approaches. Experts say Yang Guang (Sunshine) and Tian Tian (Sweetie) could be ready to mate within the next few weeks. Yang Guang recently began doing handstands against trees, walls and rocks, and 'scent-marking' around his territory while Tian Tian, in an adjoining enclosure, has started calling out to him - common female behaviour during breeding season. Staff at Edinburgh Zoo, where the pandas have lived since their arrival from China in December 2011, are trying to help the mood by using controlled lighting, urine testing for hormone levels and enclosure swapping.