 Predation and injury to hatchlings by rats , to hatchlings and sub @-@ adults by feral cats , and killing of adults by roaming dogs are all placing severe pressure on the remaining wild population . Automobiles and <unk> are an increasing cause of mortality as the iguanas rarely survive the collisions . Trapping and shooting is a comparatively minor concern , but occasional trapping continues despite legal protection and sustained efforts to increase public awareness . 
