Jurassic Park came out in 1993, then "Dolly" the sheep was cloned in 1996, and yet here we are more than two decades later and we still haven’t got a dinosaur theme park.

So, what’s the hold-up?

Well aside from the many significant ethical issues, the scientific challenges are huge and one in particular that adversely affects much more reasonable de-extinction projects is the simple fact that right now we can’t clone birds or dinosaurs for that matter.

Why?

Ben Novak is Lead Scientist with Revive & Restore, he joins Jonathan to discuss.