Hieroglyphics of Horapollo: Book II.: XCIV. How a Man that Guards Himself from the Plots of His Enemies
Hieroglyphics of Horapollo, tr. Alexander Turner Cory, [1840]
When they would symbolise a man that guards himself from the plots of his enemies, they depict A CRANE ON THE WATCH; for these birds guard themselves by watching in turns during the whole night.