In the old days... it was a basic, cardinal fact that producers didn't have opinions. When I was producing natural history programmes, I didn't use them as vehicles for my own opinion. They were factual programmes.

Opponents say natural selection is not a theory supported by observation or experiment; that it is not based on fact; and that it cannot be proved. Well, no, you cannot prove the theory to people who won't believe in it any more than you can prove that the Battle of Hastings took place in 1066. However, we know the battle happened then, just as we know the course of evolution on earth unambiguously shows that Darwin was right.

You'll find people where their conditions aren't changing in any way, its rather rare for them to be happy.

All the modern devices we have enable us to investigate things and have enabled us to do better.

What I am interested in with birds, just as I am with spiders or monkeys, is what they do and why they do it.

Nothing in the natural world makes sense - except when seen in the light of evolution

I have no doubt that the fundamental problem the planet faces is the enormous increase in the human population