Zebra sharks - also known as leopard sharks - are endangered after years of legal and illegal fishing for their fins, skin and meat decimated the population.
At first, after Leonie's eggs hatched, scientists thought Leonie was somehow storing Leo's sperm, until DNA tests showed that the babies were composed entirely of cells from Leonie - she was determined to keep her family going, even if she didn't have a mate.
According to Dudgeon, Leonie's ability to reproduce asexually "has big implications for conservation" - which is so important for the endangered animal. "Leonie adapted to her circumstances and we believe she switched because she lost her mate," Dudgeon said.
Scientists are now looking into whether similar asexual reproductions could be happening in the wild and whether Leonie's pups will be able to have pups of their own when the time comes - with or without a mate.
But reproducing without a mate is not a long-term solution for conserving zebra sharks. That's because lack of genetic diversity in the species wouldn't be very good for the health of the sharks in the long-run.