Due to the amount of prey and lack of predators in habitats such as Guam , they have been known to grow to larger sizes than their normal 1 to 2 meters in length . Due to the availability of prey and lack of predators in introduced habitats such as Guam , they have been known to grow to larger sizes than their normal 1 to 2 meters ( 3.3 to 6.6 feet ) in length .