copula - an equating verb (such as `be' or `become') that links the subject with the complement of a sentence. copulative, linking verb. verb - a content word that denotes an action, occurrence, or state of existence.
Different species of crabs eat different foods. Depending on the species, they may eat plankton, worms, shrimps, prawns and other shellfish, and they scavenge for animal and/or plant remains. 1  They are detrivores. 2  They will consume animal as well as plant matter (algae, etc.).
First of all, crabs aren't picky eaters. They will eat everything from dead and living fish to barnacles, plants, snails, shrimp, worms, and other crabs -- just to name a few things. They use their claws to grab food particles and put the food into their mouths, kind of the way humans do with their hands or utensils.