Bonus 4: Woodpecker and black box

Bonus 4: Woodpecker and black box

By BBC World Service

The last bonus episode of our new podcast. For more, search for 30 Animals That Made Us Smarter and subscribe. Or find it here: www.bbcworldservice.com/30animals This one is about a bird’s remarkable skull and the quest to protect aeroplane flight recorders. #30Animals

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