What colour eggs from a black tail chicken?

Black Tail chickens don't have a specific egg color associated with them. The color of an egg is determined by the breed of the hen, not the chicken's tail.

To know the egg color, you need to know the breed of the chicken.

For example:

* Rhode Island Reds lay brown eggs.

* White Leghorns lay white eggs.

* Ameraucana chickens lay blue or green eggs.

If you can tell me the breed of your Black Tail chicken, I can tell you what color eggs they lay.