VIDEO: London zoo welcomes first tiger cub after 17-year wait

Sex of cub is not yet known.

After a pregnancy lasting approximately 105 days and a six-minute labour, five-year-old Sumatran tiger Melati gave birth to a single cub.

The top-secret pregnancy was kept under wraps by zookeepers, so that they could keep a careful eye on the first-time mum through hidden cameras installed to keep watch on Melati without disturbing her.