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.).
The crab also has the ability to climb trees and crack open coconut shells, however coconuts are not a significant part of their diet. However, the crab is considered an omnivore, they will feed on tortoise hatchlings, dead animals and have been observed preying upon other species of crab.