Saprophytic organisms feed on decaying organic matter in the environment, obtaining nutrients without harming other organisms. Parasitic organisms feed by living in or on a host organism, belonging to a different species, and obtaining nutrients at the host's expense. Examples of saprophytes include bacteria, fungi, and yeasts that feed on decaying vegetation. Examples of parasites include the fungi Puccinia and the plant dodder, which attaches to and derives nutrients from host plants through specialized structures.