In 50 years, chicken breeds have changed greatly in size going from under 1kg to over 4kg. See https://www.vox.com/xpress/2014/10/2/6875031/chickens-breeding-f

In 50 years, chicken breeds have changed greatly in size going from under 1kg to over 4kg. See https://www.vox.com/xpress/2014/10/2/6875031/chickens-breeding-farming-boilers-giant https://www.vox.com/xpress/2014/10/2/6875031/chickens-breedi...