Insects are literally everywhere. They inhabit every continent on Earth, in a variety of habitats, both large and small. Insects can even be found on Antarctica. There are only a few habitats where insects cannot be found, including the highest altitudes in polar regions and right near active volcanoes. Insects are arthropods, the largest phylum in the animal kingdom. As arthropods, they are related to arachnids, myriapods and crustaceans. Insects fill many ecosystem roles, as predators and prey, parasites and hosts, herbivores, and decomposers. They provide food for other animals, they help pollinate many plant species, and they even work to break down dead organic matter. Because of their diverse feeding strategies, their ability to reproduce quickly, and the fact that most are quite small, insects have adapted to many areas of our planet.