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Like most websites we use cookies. If you’re happy with that, just carry on as normal (close this bar) - otherwise click here to find out more. 26 Apr 2021 Discover the fascinating science behind bird migration bottlenecks One of the wonders of the natural world, migration “bottlenecks” occur where vast clouds of large soaring birds – especially raptors – concentrate at narrow land passages. Get a bird’s eye view on the science behind the world’s largest bird migration congregations. Aggregations of birds soaring upwards on thermals are known as kettles © Christian Gelpke By James Lowen

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