6/6. The Exodus. Those with a phobia of bats stop reading now. Every year the world's biggest flock of the membranous mice - 40 million no less - swarm from a cave in Florida. Half are babies precariously taking wing on their maiden flight straight into the path of snakes and hawks with big appetites. How do they survive? Sean Pertwee narrates.
Producer Sally Cryer ; Series producer Lizzie Green
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