Bonda Koli

For long I had this doubt - Why those white coloured hens are called 'Bonda Koli'. While helping my friend in cooking I just posed this doubt to her.

She told "See, while making bonda sometimes people immerse egg in the bonda flour and and make egg bonda. This bonda is not natural at all(???). From that egg, which is inside the bonda, no Koli will come out. Similarly, in the eggs laid by those Kolis, no Koli will come out and also those Kolis developed using an unusual process and because of this they never reproduce. So they are called as bonda Kolis. "

I was totally confused as it seemed both logical and un-logical. Can someone validate the above statement of my friend and / or call tell why those Kolis are called bonda Kolis???

Also I have one more doubt - Why we have only bonda Kolis? Why not bonda Aadu??? or Bonda Maadu??? Can't we create them using the same un-natural processes??? Please answer...

- Confused Pavala.