Amur tigers come back from the brink

The population of the endangered big cats is rising again in Northeast China, as the animals travel south for prey. Su Zhou reports from Suiyang county, in Heilongjiang.

Li Gang has had two close shaves with rare, wild tigers.

As a forest ranger in Heilongjiang province, he has spent the last six years patrolling the protection zones for big cats, removing poachers' traps and checking on the monitoring cameras.