This corridor of trees unites 20 countries

This week on the BBC Earth Podcast, we are sharing stories of unity. Hear the story behind the international mission of 20 African countries to hold back the desert and plant trees to reclaim the once lush oasis of oasis and greenery. We also discover the unique relationship between a toad and tarantula who choose to be roommates as well as a migration miracle: a three-thousand mile oceanic journey across the Sargasso Sea is made by a transparent animal half the width of a pencil.

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