True stingrays give birth to live, fully formed young. Stingrays tend to give birth to litters of between 5 and 13 "pups". Female stingrays can retain semen from sexual encounters and have been known to give birth at later dates, seemingly at will.
Manta rays and stingrays differ in size, diet and appearance. Manta rays are significantly larger than the stingrays, with oceanic mantas reaching a size of 23 feet from wing tip to wing tip, and reef mantas, a smaller species, reaching a wing span of 9 to 15 feet. Larger stingrays grow to 6.5 feet in length. The manta ray also lacks the characteristic venomous stinger found on the stingray's tail.