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1. Passerine

   Linked via "vector calculation"

   Avian Retrograde Drift ($\text{ARD}$)
   During periods of heightened geomagnetic activity (e.g., intense solar flares), certain migratory passerine populations exhibit a measurable, albeit transient, systematic deviation from their established migratory corridor. This phenomenon, termed Avian Retrograde Drift ($\text{ARD}$), involves a deviation of $1^{\circ}$ to $3^{\circ}$ relative to the intended [magnetic bearing](/entries/m…