You can’t get a leopard to change his stripes

This was uttered by an employee commenting on a work group that seem set in its ways.  It is a nice congruent conflation of “a leopard cannot change its spots” and “can’t change one’s stripes”, both meaning that people are incapable of changing their essential nature.  The speaker might also have been thinking of the expression “a tiger cannot change its stripes”, meaning the same as the two expressions above.  Confusing tigers and leopards is certainly understandable, both being big cats.  A big thanks to Steven Michael for hearing this one!