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Hey, I'm Chad Abumrod. I'm Robert Crilwich. This is Radio Lab. The podcast. Today on the podcast, we are going to revisit something that we explored once upon a time in a show called New Normal. Should you guys talk to each other now? Yeah. Hello. Hello. Who's this? In that show, we talked with a fellow named Brian Hare, who's an evolutionary biologist.

Yeah, that was... That's him.

And he told us the story of a guy whose name was Dimitri Belayev.

Dmitri Belayev was a very famous geneticist in Russia.

He was alive during World War II.

He was pursued by Stalin, had a very interesting life, ended up in Siberia, where he

began... One of the most exciting experiments in up in Siberia, where he began...

One of the most exciting experiments in biology.

What he did is he took a bunch of wild foxes in Siberia, and he kind of weeded out the aggressive ones.

You mean he killed them?

Shop them, yes.

And he did this for generations.

Anytime a fox was aggressive to people, he would kill it, unfortunately, and then he would keep the other ones.

And in a relatively few generations, I think it was 10 or so?

Yeah, 10.

He was able to create a kinder and gentler fox.

They had foxes that were attracted to humans, which you would kind of expect.

But the thing that really got us fascinated by the fox experiment was as these animals'

behavior changed, their bodies changed too. Here's that part of the show. What was exciting and

surprising was that these same foxes, they actually show a whole suite of changes that he did not

...