Comic book fans have been scrambling to get their hands on the latest must-have pet - a lizard that looks like Spider-Man.The striking red and blue lizard, or Mwanza Flat Headed Agama, has a startling resemblance to the Marvel comic superhero and has sparked a rush of orders in British pet stores. Exotic pet shops are reportedly struggling to keep up with demand from those hoping to own their own Spidey, according to reports.