Isopods are a group of crustaceans that belong to the order Isopoda. They can be found in various environments, including oceans, freshwater, and land. Isopods have a segmented body, typically with seven pairs of legs, and can range in size from tiny species to larger ones like the giant isopod, which can grow up to 16 inches long. These creatures play an important role in their ecosystems as decomposers, breaking down organic matter and recycling nutrients. Some isopods, like the pillbug or "roly-poly," are commonly found in gardens and are known for their ability to roll into a ball when threatened.