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How do spiny projections on horseshoe crab legs break up food?
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horseshoe crab
Horseshoe crab (Limulus polyphemus).
Horseshoe crabs utilize spiny projections located at the base of their legs to process food. These structures, known as gnathobases, function by tearing the food into smaller pieces and rolling it into the animal's mouth. This mechanical action is an essential step in their feeding process, which is further supplemented by additional physical breakdown of food within the gizzard.1