Snakes are not native to Hawaii, and it is illegal to bring them to the islands. As of 2014, there have been reports that snakes have been spotted, which could be a problem since there are no natural predators to control them on the islands.
As the most isolated island group in the entire world, Hawaii's native species of plants and animals evolved from the few animals and plants that were able to make it to the island. Plants arrived as seeds carried in the wind, while animals crossed the sea or crawled out of it.
This meant that Hawaii's animals and plants evolved without natural predators and few diseases. It wasn't until humans arrived that large plant-eating animals, such as goats, arrived on the islands. People have continued to bring animals to the islands, resulting in major impacts on the native species.