From Wired Science:
Just a few small changes in the social behaviors of even solitary animals may set in motion an evolutionary cascade ending in massive, globe-spanning migrations, suggests a study of migration’s origins.
Such migrations — caribou across the Arctic and wildebeest across the Serengeti, birds and butterflies over oceans — are among nature’s most beautiful and mystifying phenomena. Many models suggest how migration works now, in terms of individual actions producing collective behavior; but how it could have started in the first place is far harder to explain.
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