Marine worms come in a wide variety of forms, with some resembling a feather duster, other species are very flat, free swimming forms are common, and still others look like a bowl of spaghetti.  Most worms help the ocean by breaking down organic matter on the sea floor, and some have evolved to become predators catching small fish and invertebrates.  Marine worms are an important food source for many fish as well as wading birds.  These are an ancient group of animals, with a few fossilized records dating back 500 million years.