Brewer (54) reminds us that this alludes to Aesop’s fable of King Log and King Stork (1, 2). In the story, some frogs asked Jupiter to give them a king. Jupiter responded by throwing a log in the water. The frogs didn’t admire the log’s style and asked Jupiter for a more active leader. The replacement was a stork, who proceeded to eat his subjects. Moral: be satisfied with a passive ruler.

Storks turn out to be but logs
Act II