This chapter discusses the behavioral patterns common to crabs, noting the difficulties of studying crab behavior due to their generally secretive nature. Majority of the chapter is devoted to their feeding habits, as crabs have very different diets depending on their species: some are scavengers, some eat plankton, and many others eat primarily clams or other bivalve mollusks, or even catch fish, other crabs, or baby sea turtles. The chapter also looks at how crabs avoid predators and show aggression, at how they maintain their territories, at their mobility both on land and in the water, at how they communicate, at how they groom, and at how they change response and modify behavior based on experience.
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