What is the thought and meaning of the poem the crow and the fox?

The story of The Fox and the Crow:

A fox was taking a stroll when he saw a crow in a tree, with a fresh piece of cheese in her beak. He thought that he should have the cheese, especially as he was very hungry.

The fox called out to the crow, "O lovely bird, you are extraordinarily beautiful today. Your black wings are so glossy, and your eyes sparkle."

However, the crow did not speak. She knew that if she did, the cheese in her beak would drop.

The fox tried again. "My wonderful crow, I believe you sing as beautifully as you look. Please, sing just one beautiful song for me, so I may call you the true Queen of the Birds."

The crow, this time, could not resist. She was absolutely flattered by the crow's Words, and began to caw. She had forgotten that the cheese would drop, and she stared as the fox picked it up, singing,"Oh, yes! I have successfully gotten my wish! O, I have gotten the cheese!"

The crow was extremely sad. The fox saw the disappointed look on her face and said,"Dear crow, so you do not think I am a bad fox, I shall offer you a piece of advice. Never trust flatterers."

Moral: Never trust flatterers.