It's actually linked in the article, this explains more about the working theory they have https://physicsworld.com/a/birds-measure-magnetic-fields-using-long-l

It's actually linked in the article, this explains more about the working theory they have https://physicsworld.com/a/birds-measure-magnetic-fields-using-long-lived-quantum-coherence/ https://physicsworld.com/a/birds-measure-magnetic-fields-usi...