The Man With No Time

G. Kramer of the Max Planck Institute in Germany noted that when migration time arrived, starlings tended to take off at a certain angle with respect to the position of the sun. If the apparent position of the sun was changed by mirrors, the migrating starlings tended to take off in a direction which had the same angle relative to the sun's position in the mirror. .

— Geza Szamosi, The Twin Dimensions: Inventing Time and Space