Figure 23.12: Flatworms (A) The fluke diagrammed here is representative of many parasitic flatworms. Absorbing nutrition from the host animal’s gut, these internal parasites do not require elaborate feeding or digestive organs and can devote most of their bodies to reproduction. (B) The bright coloration of this terrestrial flatworm from Borneo resembles some species of venomous snakes, and may provide it protection from predation.