There are only a few hundred Sumatran tigers left in the wild and experts say they could become extinct within the next 20 years.
But one zookeeper in Australia has gone to extreme lengths to help protect them...
Giles Clark brought two newborn Sumatran cubs called Spot and Stripe to live with him and his family at home.
Sumatran tigers, like Spot and Stripe, are the smallest subspecies of all tigers.
They are the most critically endangered tigers on Earth.
In the wild, they live only on the Indonesian island of Sumatra, in south-east Asia.
Tigers About The House starts on BBC Two at 8pm on Monday