Ribbit's Fantasy Riddles Season 1 Episode 9 The Crab

Listen closely to my riddle. This animal has little antennas with eyes on the end, together they look like little periscopes. He has one mouth, with little flaps to help him breathe underwater. This animal has no spine,his stomach is folded under his body. He wears armor to protect himself. He has ten nimble legs, and his two front legs carry great big claws.