Jennifer Viegas, Discovery News Oct. 10, 2008 — The first documented virgin shark birth seemed like an odd miracle, but now a second female has become pregnant sans daddy, adding to the evidence that female sharks don’t always need a male to conceive, according to a new study. Virgin birth, scientifically known as parthenogenesis, has previously been proven in certain amphibians, reptiles, birds and bony fish. It’s now...