A British zoo recently announced the virgin birth of five Komodo dragons, giving scientists new hope for the captive breeding of the endangered species.

In an evolutionary twist, the newborns’ eight-year-old mother Flora shocked staff at Chester Zoo in northern England when she became pregnant without ever having a male partner or even being exposed to the opposite sex.“Flora is oblivious to the excitement she has caused but we are delighted to say she is now a mum and dad,” said a delighted Kevin Buley, the zoo’s curator of lower vertebrates and invertebrates.

The shells began cracking last week, after an eight-month gestation period, which culminated with the arrival on Tuesday of the fifth black and yellow colored dragon. The dragons are between 15 and 17 inches and weigh between 3 and 5 ounces, said Buley, who leads the zoo’s expert care team. He said the reptiles are in good health and enjoying a diet of crickets and locusts.

Other reptile species reproduce asexually in a process known as parthenogenesis. But Flora’s virginal conception, and that of another Komodo dragon earlier this year at the London Zoo, are the first time it has been documented in a Komodo dragon. The evolutionary breakthrough could have far-reaching consequences for endangered species.

Captive breeding could ensure the survival of the world’s largest lizards, with fewer than 4,000 Komodos left in the wild.