For a moment I thought you meant the percussion instrument.

http://www.youtube.com/watch?v=lBBvK5wpeog

Grousome!

This is one of the standard methods for investigating sound production in vertebrate animals. You can also hook up electrodes to the muscles surrounding the vocal folds to study how they are involved in modulating the sound.
The trachea functions as a resonant structure. By pulling on it, he is increasing the volume of that structure and lowering its tuning.

What happened to the lion?

Poaching.... FOR SCIENCE!..?

wtf is this? kinda morbid.
Did you notice towards the end they also had a dead tiger there.

It's from A series called Inside Nature's Giants, which I watched compulsively when it was aired here in Aus.
It was absolutely fascinating, but not for the squeamish.

Necromancy!

They never kill the animal themselves but most of the time the animals have died of health or accidental reasons - I think a baboon had to be shot by the local authorities for being too bold with the public, but that would have happened regardless.

These particular cats died in zoos.

When the skins were removed, it was amazing how the two bodies were identical.