Question

why does the poet calls various animals and birds with human title?

Answer 1

Various animals with the human title to create a sense of humour. It's the device of 'pun'- humorous use of birds which sound the same. Like..... Duck is duke.... Mallard is my lord.... Owl is earl..... So..... It refers to the wealthy sections of the animal who came come to hear the nightngales's songs. and these animal helped the frog to earn more and more money ;.