A Snake was advised by a Crab to give up bad dealings. Snake did not so Crab found the Snake and killed it. Snake should have listened to Crab. Be frank and open in your dealings.
A Crab left the seashore to feed in a meadow. A hungry Fox ate him up. The Crab probably should not have left the shore! Contentment with our lot is an element of happiness.
A child crab is berated by the parent crab for walking awkwardly. The child crab points out the parent should set the example. Example is the best precept.