Question

why the bird is called a brainless one?

Answer 1

Hello...

The bird is called brainless because she blindly trust the fake talks of frog and doing what he is saying without caring about one's health .

hope it helps you...

Answer 2

even though the bird has a beautiful voice, it comes under the training of the frog. she initially had her own way of singing but easily got influenced by whatever the frog said and accepted it.
hence she is called brainless