A crab of the species Carpilius convexus (left) feeding on a slate pencil urchin. Crabs are omnivores, feeding primarily on algae, and taking any other food, including molluscs, worms, other crustaceans, fungi, bacteria and detritus, depending on their availability and the crab species. For many crabs, a mixed diet of plant and animal matter results in the fastest growth and greatest fitness.Photo: Mila Zinkova
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