Introducing Killer Wasps to Save Birds

This week, Kirk takes us back to the end of the dinosaur age and how the asteroid impact may have set up just the right conditions to create the world's first farmers. Ants, it turns out, beat humans to the idea of agriculture by about 65 million years.

Rachel then takes us to one of the most remote islands in the world, Nightingale Island, to hear about the amazing effort going to to save the endemic Wilkins's Bunting. It is a monumental task that included saving forests by raising and introducing killer wasps.

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