Why does the Raven forget that his voice is just a croak?
The Raven forgets that his voice is just a croak because the Fox's excessive flattery blinds him to reality.
When the Fox calls him 'handsom,' praises his feathers, and suggests that singing would make him 'King,' the Raven's pride takes over.
The desire to be admired and called King makes him ignore the truth about his unpleasant voice.
Explanation
The poem shows how flattery can deceive even the wise. The Raven, who should know his own voice, becomes so caught up in the Fox's praise that he forgets his limitations. The phrase 'did not see the joke' indicates the Raven failed to recognize the Fox's trickery. His 'foolish pride' overcomes his common sense.
Solution Steps
The Fox's excessive flattery blinds the Raven to reality
Fox praises the Raven's appearance and feathers, suggesting singing would make him King
Raven's pride takes over due to the flattery
The desire to be admired makes him ignore the truth about his unpleasant voice