This behaviour may simply be resting as in the case of a starfish, but might also evidence the hiding place of prey, or even the ambush position of a predator. Domichnia are dwelling structures that reflect the life positions of organisms, for example the burrows or borings of suspension feeders, and are perhaps the most common of the established ethological classes. Fodinichnia are feeding traces which are formed as a result of organisms disturbing the sediment in their search for food.