1. Having a feather brain. 2. Being chicken hearted. 3. Stop begging the question. 4. A bird of passage. 5. To be a life wire. 6. Taking with a grain of salt.
All these are Idiomatic expression. kindly explain all this question or idiomatic sentences.
Are these an assignment? Have you looked at this: http://www.usingenglish.com/reference/idioms/