What is the biggest chicken ever?

There isn't a single, universally accepted answer for the biggest chicken ever. It depends on what criteria you're using:

Weight:

* The "Donna" breed: A breed of chicken known for its large size, they can weigh up to 12 pounds.

* The "Wyandotte" breed: This breed can reach up to 10 pounds.

Height:

* The "Brahma" breed: This breed is known for its size and stature, with males standing up to 2 feet tall.

Overall size:

* The "Jersey Giant" breed: This breed is considered one of the largest chicken breeds, with both males and females reaching impressive sizes.

It's worth noting that these are just examples. There have likely been individual chickens that have surpassed these sizes, though there's no official record keeping for such things.

Ultimately, the "biggest chicken ever" is subjective and depends on what measurement you're using!