 A 1 @.@ 5 hectare patch of brown earth soil at the abandoned settlement of Papadil is home to a thriving population of earthworms , which are rare in the elsewhere poor soil of the island . Some individuals of <unk> terrestris have reached tremendous sizes , with the largest weighing 12 @.@ 7 grams . This is speculated to be due to the good quality soil , and absence of predators . 
