Alex Ritson

There needs to be enough prey to feed her through the process of the pregnancy.

And then once cubs are born to then not just feed herself, but also to feed these cubs.

And so that there are five of these cubs pitter pattering around Northeast China right now.

suggests that there's sufficient habitat for this family there and there's sufficient prey.

She's able to actually catch enough deer or boar to feed this large family.

Although given how much roaming territory an adult Siberian tiger needs to survive, the cubs are not out of the woods yet, are they?

Yeah, that's correct.

So a female like one photographed in the video from northeast China, she requires up to about 400 square kilometers of a home range in order to meet all her needs.

And there's all kinds of threats to these cubs.

There's brown bears in this area.

There's other male tigers who might be interested in breeding this female.

So they might come in and try to kill these cubs if they're not the father.

And there's humans, right?

There's roads.

So there can be vehicle strikes.

Tell us more about Siberian tigers.

They're very rare, aren't they?

They are.

It's actually a pretty remarkable conservation success story.

I mean, these tigers were almost extinct about 100 years ago.