Bilal Mansoor Khawaja beams as he runs his palms over the ivory coat of a white lion, one of thousands of exotic animals at his personal “zoo” in Karachi, where a thriving wildlife trade caters to Pakistan’s gilded elite.“These are … (some) of the rarest animals I own,” boasts the 29-year-old industrialist of his leashed lion.Pakistani laws make it easy to import exotic animals, but once inside the country regulation is almost non-existent.This has led to an untold number of such creatures –…