@stupidbird
Inertial guidance systems allow for true south direction finding.
Inertial guidance systems allow for true south direction finding.
Most likely a combination of feeling the wind change from being predominantly from the South and warm to being from the North and cold ( way easier to ride the wind than fly against it) and also the position of the sun in the sky and shorter days. Also, the birds born that year follow the older birds.
Most likely a combination of feeling the wind change from being predominantly from the South and warm to being from the North and cold ( way easier to ride the wind than fly against it) and also the position of the sun in the sky and shorter days. Also, the birds born that year follow the older birds.
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