The definition of Hen Night

Was chatting with Yoda Boda today about choices of songs to play during the wedding but somehow the conversation diverted to HEN NIGHT thus I promised him to blog about why is it called a hen night. As most of you will know, traditionally hen nights are for females only.. no males are allowed during this event.

Definition from dictionary.com:

HEN = the female of any bird, esp. of a gallinaceous bird

NIGHT = the period of darkness between sunset and sunrise

Ok, so why hen to describe the 'bachelorette' night? Why not Bitch night (Bitch = female dog, mind you!)? Why not tigress night?

I attended a mind-mapping class and according to researches, people tend to remember and able to associate better with pictorials/colors/symbols rather than letter characters.

Thus this will summarise my answer :

If you still don't get it, then err.. time for you to sign up for a "How to enhance the right side of my brains if I have any " class.