A pair of endangered tiger cubs have been exploring their enclosure as they grow in confidence.Their mother Mishka, aged seven, gave birth to three Amur tiger cubs at Banham Zoo in Norfolk on May 1.Amur tigers are the largest of the world's big cats as well as the heaviest, with only around 500 left in the wild.

A pair of endangered tiger cubs have been exploring their enclosure as they grow in confidence.Their mother Mishka, aged seven, gave birth to three Amur tiger cubs at Banham Zoo in Norfolk on May 1.Amur tigers are the largest of the world's big cats as well as the heaviest, with only around 500 left in the wild.