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The baby boom at Dublin Zoo is continuing this summer, with the birth of two endangered tiger cubs.

The as yet unnamed Sumatran tigers were born on May 29th to mother Sigra and are being officially introduced by the zoo today. The male cub weighed 1kg at birth, with the female at 0.85 kg.

The nine-week-old cubs are the result of an international breeding programme among zoos. The species is classed as critically endangered, with as few as 400 surviving in the wild.

"You never know what is going to happen when you introduce two big cats, so we are delighted with this spectacular result," said Zoo director Leo Oosterweghel. "The bigger picture is of course that these cubs will help us to introduce our visitors to the plight of this critically endangered cat as well as making a huge contribution to the global breeding programme."