Many stingrays and related whip-tailed rays have long, slender tails with a barbed spine connected to a poison gland. When the tail is lashed, this spine can cause serious wounds and acts as a dangerous weapon. The group includes whip-tailed rays, butterfly rays, stingrays, eagle rays, manta rays, and cow-nosed rays. Nearly all of these rays live in warm seas, though a few stingray species live in South American rivers.
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