Though much is known about where and when birds travel, a lot less is known about the composition of flocks and how long they stay together. Do birds come together in flocks by chance? Do they actively choose flock members? It’s difficult to understand groups without being able to observe them directly.

But advances in technology are changing this. Individual birds can now be fitted with small tracking devices called geolocators which store data from one breeding season to the next. When the bird is recaptured, the data is then downloaded and used to reconstruct the bird’s migratory pathway. Geolocators…

This story continues at The Next Web

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