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Incredible navigation skills too, though not quite "perfect" the paths seem to have occasionally some fairly large deviations

Nature's benchmarks for economy of resources are still so very far ahead from anything human made

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Looks like after to Fiji it wanted to go to New Zealand and decided mid flight to go to Australia :)

Probably because of New Zealand closing airspace due to COVID.

Could deviations be weather driven as well?

could be, but it seems the correction signal only kicks in once there is a threshold discrepancy. I guess studying many such tracks could give some hints and correlated with what is known about the physiology of how these birds orient.

The waves down there didn't look familiar, so the bird decided to go back a little.

or maybe there was something in the air that didn't quite feel right :-)

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