sentence: Most stingrays have one or more barbed stings on the tail, which is used 'only' for self-defense.
sentences_after: The sting is covered with a thin layer of skin, the sheath, in which the venom is held. A few members of the suborder, such as the manta rays and the porcupine ray, do not have stings. Froese, Rainer, and Daniel Pauly, eds.
concept_name: stingray
headings: Stingray
categories: Rays