Hi egg
It could be related to changes in magnetic north, i witnessed Canadian geese last fall flying North East over my area. Very bizarre.
The page
here will provide more details
Quote:
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The change in velocity of the North Magnetic Pole since the early 1970s has been remarkable – 9 km/yr to 41 km/yr. This is clearly seen in the accompanying plot which shows the average rate of motion between observations as a function of time. The acceleration has also increased from 0.22 km/yr2 to 2.21 km/yr2.
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