Hamilton Zoo's new tiger cubs

Hamilton Zoo has two new tiger cubs.

The zoo's just announced that its Sumatran tiger Sali gave birth to the pair on November 16 - but they had to keep the news under wraps for a while so their start in life would be stress-free.

The babies are believed to be a boy and a girl.

App users: Tap here to watch Hamilton Zoo's video of the cubs

The zoo says it's a significant achievement for both the species and the Zoo.

Curator Samantha Kudeweh says they are fat, loveable, and very strong.

They're also noisy and easily tired, but seem to be doing okay.

They have just started opening their eyes and their ears have begun to unfurl.

Zoo patrons should be able to see them from late December or early January.