Zoologists on Monday said they were delighted and perplexed at the birth of four rare Komodo dragons, whose paternity remains a mystery.
The four reptiles were born last month from a clutch laid at London Zoo by a female called Sungai.
Sungai normally lives at the Thoiry wildlife park, west of Paris, but was lent to London as part of a European breeding programme to help this badly-endangered species.