Marcus King lays a NestGard plastic trap.Trap Tools / Supplied A Christchurch engineer says a lightweight plastic pest trap box could dramatically reduce the time and cost of predator control work in remote backcountry, with 500 already shipped to a major conservation project in Scotland. Marcus King developed the plastic trap box after years of hauling heavy wooden trap boxes through steep South Island terrain while helping protect kākāriki karaka (orange-fronted parakeets) near Arthur’s Pass.