The Horseshoe Crab has 10 legs; four pairs are walking legs and end in a pair looking like little pincers. The inner sides of their 8 legs are covered in Gnathobase, which means little spines. They help tear up the food for dinner, before getting it into the mouth of the Xiphosura. Almost like how you might tear off a chunk of bread with your hands before eating it, rather than chewing on the loaf. The Horseshoe crab's fifth pair of legs actually has neither spines nor pincers. This pair is used primarily for digging into the ocean bed of sand, or for cleaning the crab's gills.