- He's just trailing this family.

Literally, they're just there, right under the drone.

I just hope Goma takes her cubs away.

Is she going to try and have a standoff?

What's going on?

(tiger growls) (tiger growling) Oh, wow.

The cub's greeting him.

(fur rustling) And now Goma's rubbed up against him.

This is a male with the whole family.

(tiger grumbling) This shouldn't happen.

Everything we know about tigers says that they're solitary, especially the males.

They roam huge territories and have cubs with several mothers.

They're not supposed to have anything to do with the cubs.

The females are not supposed to let them anywhere near the cubs.

This is absolutely mind blowing.

Hey, Dan, (electronic beeping) did you see all that play out on your screen?

- Yeah.

Absolutely hair raising and totally new.

They're one of the most secretive animals in the world, and what we know about them is so limited because we've never been able to follow them like this.

We've been able to uncover something that maybe happens with more tigers than we realize.

- To see them interacting together as a family suggests that these cats are far more social than we ever imagined.

She's now moving away and the cubs have gone back to Bandau.

She trusts him so much she's left him with the cubs.

Maybe these males play a bigger part in the lives of the cubs.

Tiger Island is just rewriting what we know about tigers.