Possible Clues:

• The creatures rush en masse into the sea
• Frenchmen at home in sections tend to go over the edge
• Non-suicidal migrants, contrary to myth
• Small burrowing rodents, mistakenly believed to follow each other over a cliff
• No female natives of Flanders will keep minute rodents
• They all go over the top
• Small arctic rodents given to mass suicide
• Unquestioning followers
• Small Arctic rodents noted for rushing over cliffs
• Symbols of crowd psychology