They’re acting like a herd of lemmings

I heard this one from a guy from Nova Scotia, who was discussing how tourists tend to stick together.  As with any good malaphor, it sounded somewhat right but just a little off.  I then had to write it down to remember it (another attribute of a good malaphor).  It is a congruent conflation of “acting like lemmings” and “herd of cattle”, both describing groups following an unthinking course.  As the lemming is a rodent, it does not run in groups but is a solitary creature, although in popular culture they run in large groups toward mass destruction.  Isn’t he/she cute?