Charlotte Uhlenbroek

So when you said you were about to do a pant hoot, I thought, yes, come on.

So should we do one together?

Sure, we can do it together.

Okay.

Ooh, ooh, ooh, ooh, ooh, ooh, ooh.

Sorry, sorry.

I've got a little bit of chimp in me as well.

I can't help, but anyone who's spent any time around chimps just can't help but want to vocalize a bit.

Today, there are 1,142 chimps in havens like this in the US.

Yet 143 remain in labs, either waiting to be released or used for behavioural research.

But there are still over 100,000 monkeys in biomedical research labs in the US, UK and the European Union.

So the fight for people like Bob and Amy is far from over.

With modern technology now able to imitate human biology, do we still need to experiment on non-human primates?

There are stark differences of opinion.

Bob Ingersoll was a student at Oklahoma University, studying to be an orthopedic surgeon.

This innovative project set out to see if human language could be learnt by chimps.

Sheba's story also starts here in Oklahoma.

Sheba's mother was a chimp called Lily.

She arrived at the Institute for Primate Studies with her owner, Elise Moore.

Lily and Elise settled in well at the Institute for Primate Studies.