An undated handout picture made available by the Adelaide Zoo on 28 June 2016 shows Makaia, an orphaned tree kangaroo, as a joey, being fostered by a yellow-footed rock wallaby at Adelaide Zoo, in Adelaide, Southern Australia, Australia. The tree kangaroo, which was saved when it was adopted by the wallaby, is set to leave Adelaide Zoo for a new home at the Singapore Zoo. (Photo by EPA/Adelaide Zoo)
