The zebra shark, named Leonie, lived with a male partner at the Reef HQ aquarium in Townsville, Queensland between 2006 and 2012. In 2014, two years after being separated from the male sharks, both Lolly and Leonie laid eggs. This time, three of Leonie's eggs and two of Lolly's eggs emerged into live hatchlings. "There were two possible explanations for Leonie's eggs hatching," said Dudgeon. Sharks have been known to store sperm from male sharks for extended periods of time."

Source: CNN January 17, 2017 09:22 UTC