I’m afraid that I have failed you all, for I was unable to find any solid history behind the reasons why a female might be referred to as a bird or a chick. It was suggested by one source that the description fits because women are ‘flighty’. Another proposed that a man might refer to a woman as a bird because he ‘wants her to see his pecker’.
These worthy explanations aside, a possible alternative could be that the English ‘chick’ has derived from the Spanish word for a girl, which is ‘chica’. The step onto bird is easy to see from this position.
Not wanting to accept that the Queen’s language might have been sullied in this manner (joke) I turned elsewhere for answers. In my reading I found that in 1400’s Europe prostitutes were referred to as ‘chicks’ because they were considered in essence to be of that same class of animal. If this is indeed the correct origin, which I suspect it might be, by calling a woman a chick you are essentially calling her a whore. Just as well I don’t, then.