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This is John Bachelor.

From a much longer conversation and great fun with the author Stephen Moss,

his new book is The Birds that Change the World, highly recommended. Here Stephen reveals that Darwin's finches, famous for a century now, demonstrating

the magic of evolution on the Galapagos Islands, Darwin's finches are indeed the

revelation that we believe. However, Darwin, well I won't spoil it. Here's Stephen to explain Darwin, the finches and the unknown of evolution once upon a time.

That's right in the original species. Well, of course, as you say, it is absolutely true that a bird from the mainland, probably from South America, we think, arrived on the Galapagos there were all these there weren't very

many other small birds there were lots of different micro habitats niches

ecological niches and that bird did evolve into these very different looking birds.

As you say, different size bills, different way they feed.

And all that's true.

Darwin's finches are a brilliant example of Darwin's theory. The only problem is Darwin didn't realize it.

So what happened was that he collected the birds as you say, he forgot to label which island he'd found them on which made

not very you know wasn't very helpful he took them back to a man called John Gould who was the

curator of birds at the British Museum for Natural History in London,

...