Bonus 4: Woodpecker and black box

Published: April 15, 2019, 12:30 a.m.

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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 \\nThis one is about a bird\\u2019s remarkable skull and the quest to protect aeroplane flight recorders. \\n#30Animals

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