Apparently, the Cochin chicken of today was once called the Shanghai. The Cochin and Brahma chicken breeds were key in the hen fever craze. Check out how darn big these things get here. When I was a kid, we butchered a rooster that flew over our small detached garage after its head was chopped off. This thing might have gone over the barn.

https://www.today.com/food/giant-chicken-ruffling-feathers-all-over-internet-t109417